21655115356432 has 40 divisors (see below), whose sum is σ = 43380426189312. Its totient is φ = 10461298848000.

The previous prime is 21655115356363. The next prime is 21655115356507. The reversal of 21655115356432 is 23465351155612.

It is a super-2 number, since 2×21655115356432² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35074444 + ... + 35686507.

Almost surely, 2^{21655115356432} is an apocalyptic number.

It is an amenable number.

21655115356432 is an abundant number, since it is smaller than the sum of its proper divisors (21725310832880).

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

21655115356432 is a wasteful number, since it uses less digits than its factorization.

21655115356432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70761607 (or 70761601 counting only the distinct ones).

The product of its digits is 3240000, while the sum is 49.

The spelling of 21655115356432 in words is "twenty-one trillion, six hundred fifty-five billion, one hundred fifteen million, three hundred fifty-six thousand, four hundred thirty-two".