21920962974 has 16 divisors (see below), whose sum is σ = 43843706112. Its totient is φ = 7306690968.

The previous prime is 21920962963. The next prime is 21920962979. The reversal of 21920962974 is 47926902912.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21920962979) 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 7 ways as a sum of consecutive naturals, for example, 128517 + ... + 245679.

It is an arithmetic number, because the mean of its divisors is an integer number (2740231632).

Almost surely, 2^21920962974 is an apocalyptic number.

21920962974 is an abundant number, since it is smaller than the sum of its proper divisors (21922743138).

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

21920962974 is a wasteful number, since it uses less digits than its factorization.

21920962974 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148351.

The product of its (nonzero) digits is 979776, while the sum is 51.

The spelling of 21920962974 in words is "twenty-one billion, nine hundred twenty million, nine hundred sixty-two thousand, nine hundred seventy-four".