21388626522 has 24 divisors (see below), whose sum is σ = 46352482176. Its totient is φ = 7127933256.

The previous prime is 21388626503. The next prime is 21388626527. The reversal of 21388626522 is 22562688312.

21388626522 is a `hidden beast` number, since 2 + 1 + 388 + 6 + 265 + 2 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21388626527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50698 + ... + 212949.

It is an arithmetic number, because the mean of its divisors is an integer number (1931353424).

Almost surely, 2^21388626522 is an apocalyptic number.

21388626522 is an abundant number, since it is smaller than the sum of its proper divisors (24963855654).

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

21388626522 is a wasteful number, since it uses less digits than its factorization.

21388626522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268162 (or 268159 counting only the distinct ones).

The product of its digits is 552960, while the sum is 45.

The spelling of 21388626522 in words is "twenty-one billion, three hundred eighty-eight million, six hundred twenty-six thousand, five hundred twenty-two".