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21013220523320 = 23511091282136947
BaseRepresentation
bin1001100011100100001011…
…00010110111110100111000
32202101211210110122002201122
410301302011202313310320
510223240033423221240
6112405201254204412
74266104123251454
oct461620542676470
982354713562648
1021013220523320
116771725198863
122434605053708
13b956cc542c2c
1452908c435664
152669070ae4b5
hex131c858b7d38

21013220523320 has 64 divisors (see below), whose sum is σ = 47327350874400. Its totient is φ = 8396826780160.

The previous prime is 21013220523289. The next prime is 21013220523397. The reversal of 21013220523320 is 2332502231012.

It is a self number, because there is not a number n which added to its sum of digits gives 21013220523320.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 568721087 + ... + 568758033.

Almost surely, 221013220523320 is an apocalyptic number.

21013220523320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21013220523320 is an abundant number, since it is smaller than the sum of its proper divisors (26314130351080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21013220523320 is a wasteful number, since it uses less digits than its factorization.

21013220523320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50888 (or 50884 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 26.

Adding to 21013220523320 its reverse (2332502231012), we get a palindrome (23345722754332).

The spelling of 21013220523320 in words is "twenty-one trillion, thirteen billion, two hundred twenty million, five hundred twenty-three thousand, three hundred twenty".

Divisors: 1 2 4 5 8 10 20 40 1109 2218 4436 5545 8872 11090 12821 22180 25642 36947 44360 51284 64105 73894 102568 128210 147788 184735 256420 295576 369470 512840 738940 1477880 14218489 28436978 40974223 56873956 71092445 81948446 113747912 142184890 163896892 204871115 284369780 327793784 409742230 473697487 568739560 819484460 947394974 1638968920 1894789948 2368487435 3789579896 4736974870 9473949740 18947899480 525330513083 1050661026166 2101322052332 2626652565415 4202644104664 5253305130830 10506610261660 21013220523320