21022072918 has 32 divisors (see below), whose sum is σ = 39342044160. Its totient is φ = 8184576960.

The previous prime is 21022072901. The next prime is 21022072987. The reversal of 21022072918 is 81927022012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 171178 + ... + 267106.

It is an arithmetic number, because the mean of its divisors is an integer number (1229438880).

Almost surely, 2^21022072918 is an apocalyptic number.

21022072918 is a deficient number, since it is larger than the sum of its proper divisors (18319971242).

21022072918 is a wasteful number, since it uses less digits than its factorization.

21022072918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97372.

The product of its (nonzero) digits is 8064, while the sum is 34.

The spelling of 21022072918 in words is "twenty-one billion, twenty-two million, seventy-two thousand, nine hundred eighteen".