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21629642731605 = 3255923364154547
BaseRepresentation
bin1001110101100000010110…
…01010111111000001010101
32211120202212222202202220100
410322300023022333001111
510313340002014402410
6114000304245324313
74361455465465656
oct472601312770125
984522788682810
1021629642731605
11698a097490517
122513b77706699
13c0b88857253c
1454ac4775352d
15277983a218c0
hex13ac0b2bf055

21629642731605 has 96 divisors (see below), whose sum is σ = 38350900897920. Its totient is φ = 11273794191360.

The previous prime is 21629642731603. The next prime is 21629642731633. The reversal of 21629642731605 is 50613724692612.

It is a happy number.

21629642731605 is a `hidden beast` number, since 2 + 1 + 6 + 2 + 9 + 6 + 4 + 27 + 3 + 1 + 605 = 666.

It is not a de Polignac number, because 21629642731605 - 21 = 21629642731603 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21629642731603) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 396504942 + ... + 396559488.

It is an arithmetic number, because the mean of its divisors is an integer number (399488551020).

Almost surely, 221629642731605 is an apocalyptic number.

It is an amenable number.

21629642731605 is a deficient number, since it is larger than the sum of its proper divisors (16721258166315).

21629642731605 is a wasteful number, since it uses less digits than its factorization.

21629642731605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55491 (or 55488 counting only the distinct ones).

The product of its (nonzero) digits is 6531840, while the sum is 54.

The spelling of 21629642731605 in words is "twenty-one trillion, six hundred twenty-nine billion, six hundred forty-two million, seven hundred thirty-one thousand, six hundred five".

Divisors: 1 3 5 9 15 45 59 177 233 295 531 641 699 885 1165 1923 2097 2655 3205 3495 5769 9615 10485 13747 28845 37819 41241 54547 68735 113457 123723 149353 163641 189095 206205 272735 340371 448059 490923 567285 618615 746765 818205 1344177 1701855 2240295 2454615 3218273 6720885 8811827 9654819 12709451 16091365 26435481 28964457 34964627 38128353 44059135 48274095 63547255 79306443 104893881 114385059 132177405 144822285 174823135 190641765 314681643 396532215 524469405 571925295 749857609 1573408215 2062912993 2249572827 3749288045 6188738979 6748718481 8146758091 10314564965 11247864135 18566216937 24440274273 30943694895 33743592405 40733790455 73320822819 92831084685 122201371365 366604114095 480658727369 1441976182107 2403293636845 4325928546321 7209880910535 21629642731605