21988092036 has 24 divisors (see below), whose sum is σ = 51325747200. Its totient is φ = 7326478432.

The previous prime is 21988091971. The next prime is 21988092101. The reversal of 21988092036 is 63029088912.

It is an interprime number because it is at equal distance from previous prime (21988091971) and next prime (21988092101).

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, 328836 + ... + 390011.

It is an arithmetic number, because the mean of its divisors is an integer number (2138572800).

Almost surely, 2^21988092036 is an apocalyptic number.

It is an amenable number.

21988092036 is an abundant number, since it is smaller than the sum of its proper divisors (29337655164).

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

21988092036 is a wasteful number, since it uses less digits than its factorization.

21988092036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721403 (or 721401 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The spelling of 21988092036 in words is "twenty-one billion, nine hundred eighty-eight million, ninety-two thousand, thirty-six".