Search a number
-
+
21021106762685 = 523617142205549
BaseRepresentation
bin1001100011110010110111…
…00110011111001110111101
32202102121011001222120101002
410301321123212133032331
510223402211312401220
6112412544011500045
74266503423215121
oct461713346371675
982377131876332
1021021106762685
116775001826157
122436046157625
13b96388335063
145295d9969581
15266c195d7c75
hex131e5b99f3bd

21021106762685 has 32 divisors (see below), whose sum is σ = 27130402828800. Its totient is φ = 15599170540800.

The previous prime is 21021106762637. The next prime is 21021106762699. The reversal of 21021106762685 is 58626760112012.

It is not a de Polignac number, because 21021106762685 - 226 = 21021039653821 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 20604710 + ... + 21600839.

It is an arithmetic number, because the mean of its divisors is an integer number (847825088400).

Almost surely, 221021106762685 is an apocalyptic number.

It is an amenable number.

21021106762685 is a deficient number, since it is larger than the sum of its proper divisors (6109296066115).

21021106762685 is a wasteful number, since it uses less digits than its factorization.

21021106762685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42205709.

The product of its (nonzero) digits is 483840, while the sum is 47.

Adding to 21021106762685 its reverse (58626760112012), we get a palindrome (79647866874697).

The spelling of 21021106762685 in words is "twenty-one trillion, twenty-one billion, one hundred six million, seven hundred sixty-two thousand, six hundred eighty-five".

Divisors: 1 5 23 61 71 115 305 355 1403 1633 4331 7015 8165 21655 99613 498065 42205549 211027745 970727627 2574538489 2996593979 4853638135 12872692445 14982969895 59214385247 68921661517 182792232719 296071926235 344608307585 913961163595 4204221352537 21021106762685