21722914902 has 24 divisors (see below), whose sum is σ = 47044894824. Its totient is φ = 6683973504.

The previous prime is 21722914897. The next prime is 21722914919. The reversal of 21722914902 is 20941922712.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10710483 + ... + 10712510.

It is an arithmetic number, because the mean of its divisors is an integer number (1960203951).

Almost surely, 2^21722914902 is an apocalyptic number.

21722914902 is an abundant number, since it is smaller than the sum of its proper divisors (25321979922).

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

21722914902 is a wasteful number, since it uses less digits than its factorization.

21722914902 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21423024 (or 21423011 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The spelling of 21722914902 in words is "twenty-one billion, seven hundred twenty-two million, nine hundred fourteen thousand, nine hundred two".