21671597522 has 16 divisors (see below), whose sum is σ = 32578465920. Its totient is φ = 10812136608.

The previous prime is 21671597503. The next prime is 21671597539. The reversal of 21671597522 is 22579517612.

21671597522 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1806179 + ... + 1818137.

It is an arithmetic number, because the mean of its divisors is an integer number (2036154120).

Almost surely, 2^21671597522 is an apocalyptic number.

21671597522 is a deficient number, since it is larger than the sum of its proper divisors (10906868398).

21671597522 is a wasteful number, since it uses less digits than its factorization.

21671597522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13865.

The product of its digits is 529200, while the sum is 47.

The spelling of 21671597522 in words is "twenty-one billion, six hundred seventy-one million, five hundred ninety-seven thousand, five hundred twenty-two".