21221365125336 has 32 divisors (see below), whose sum is σ = 56174201803440. Its totient is φ = 6657683176448.

The previous prime is 21221365125307. The next prime is 21221365125379. The reversal of 21221365125336 is 63352156312212.

It is a super-2 number, since 2×21221365125336² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26006574501 + ... + 26006575316.

Almost surely, 2^{21221365125336} is an apocalyptic number.

It is an amenable number.

21221365125336 is an abundant number, since it is smaller than the sum of its proper divisors (34952836678104).

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

21221365125336 is a wasteful number, since it uses less digits than its factorization.

21221365125336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52013149843 (or 52013149839 counting only the distinct ones).

The product of its digits is 388800, while the sum is 42.

The spelling of 21221365125336 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred sixty-five million, one hundred twenty-five thousand, three hundred thirty-six".