21655252064024 has 16 divisors (see below), whose sum is σ = 40613374614120. Its totient is φ = 10825018833600.

The previous prime is 21655252064023. The next prime is 21655252064059. The reversal of 21655252064024 is 42046025255612.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655252064023) 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, 325864502 + ... + 325930949.

Almost surely, 2^{21655252064024} is an apocalyptic number.

It is an amenable number.

21655252064024 is a deficient number, since it is larger than the sum of its proper divisors (18958122550096).

21655252064024 is a wasteful number, since it uses less digits than its factorization.

21655252064024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 651799610 (or 651799606 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 44.

The spelling of 21655252064024 in words is "twenty-one trillion, six hundred fifty-five billion, two hundred fifty-two million, sixty-four thousand, twenty-four".