21937172880 has 80 divisors (see below), whose sum is σ = 77720275584. Its totient is φ = 5014210560.

The previous prime is 21937172869. The next prime is 21937172891. The reversal of 21937172880 is 8827173912.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21937172869) and next prime (21937172891).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 6527241 + ... + 6530600.

Almost surely, 2^21937172880 is an apocalyptic number.

21937172880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21937172880 is an abundant number, since it is smaller than the sum of its proper divisors (55783102704).

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

21937172880 is a wasteful number, since it uses less digits than its factorization.

21937172880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13057864 (or 13057858 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 48.

The spelling of 21937172880 in words is "twenty-one billion, nine hundred thirty-seven million, one hundred seventy-two thousand, eight hundred eighty".