21153163405504 has 56 divisors (see below), whose sum is σ = 46763500386960. Its totient is φ = 9426343363584.

The previous prime is 21153163405501. The next prime is 21153163405511. The reversal of 21153163405504 is 40550436135112.

It is not an unprimeable number, because it can be changed into a prime (21153163405501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438328894 + ... + 438377149.

It is an arithmetic number, because the mean of its divisors is an integer number (835062506910).

Almost surely, 2^{21153163405504} is an apocalyptic number.

It is an amenable number.

21153163405504 is an abundant number, since it is smaller than the sum of its proper divisors (25610336981456).

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

21153163405504 is a wasteful number, since it uses less digits than its factorization.

21153163405504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876706097 (or 876706087 counting only the distinct ones).

The product of its (nonzero) digits is 216000, while the sum is 40.

The spelling of 21153163405504 in words is "twenty-one trillion, one hundred fifty-three billion, one hundred sixty-three million, four hundred five thousand, five hundred four".