21972378722 has 32 divisors (see below), whose sum is σ = 41616675072. Its totient is φ = 8477466624.

The previous prime is 21972378719. The next prime is 21972378763. The reversal of 21972378722 is 22787327912.

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, 2001503 + ... + 2012450.

It is an arithmetic number, because the mean of its divisors is an integer number (1300521096).

Almost surely, 2^21972378722 is an apocalyptic number.

21972378722 is a deficient number, since it is larger than the sum of its proper divisors (19644296350).

21972378722 is a wasteful number, since it uses less digits than its factorization.

21972378722 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4014002.

The product of its digits is 1185408, while the sum is 50.

The spelling of 21972378722 in words is "twenty-one billion, nine hundred seventy-two million, three hundred seventy-eight thousand, seven hundred twenty-two".