21550056502 has 16 divisors (see below), whose sum is σ = 34827396912. Its totient is φ = 9941675040.

The previous prime is 21550056491. The next prime is 21550056509. The reversal of 21550056502 is 20565005512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21550056509) 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, 128848 + ... + 244339.

It is an arithmetic number, because the mean of its divisors is an integer number (2176712307).

Almost surely, 2^21550056502 is an apocalyptic number.

21550056502 is a deficient number, since it is larger than the sum of its proper divisors (13277340410).

21550056502 is a wasteful number, since it uses less digits than its factorization.

21550056502 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 375423.

The product of its (nonzero) digits is 15000, while the sum is 31.

The spelling of 21550056502 in words is "twenty-one billion, five hundred fifty million, fifty-six thousand, five hundred two".