21655044166432 has 24 divisors (see below), whose sum is σ = 42633478074096. Its totient is φ = 10827494179392.

The previous prime is 21655044166423. The next prime is 21655044166433. The reversal of 21655044166432 is 23466144055612.

It is a super-2 number, since 2×21655044166432² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21655044166433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18067803 + ... + 19229029.

It is an arithmetic number, because the mean of its divisors is an integer number (1776394919754).

Almost surely, 2^{21655044166432} is an apocalyptic number.

It is an amenable number.

21655044166432 is a deficient number, since it is larger than the sum of its proper divisors (20978433907664).

21655044166432 is a wasteful number, since it uses less digits than its factorization.

21655044166432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744000 (or 1743992 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 49.

The spelling of 21655044166432 in words is "twenty-one trillion, six hundred fifty-five billion, forty-four million, one hundred sixty-six thousand, four hundred thirty-two".