21944443880 has 32 divisors (see below), whose sum is σ = 52279412040. Its totient is φ = 8261437440.

The previous prime is 21944443877. The next prime is 21944443891. The reversal of 21944443880 is 8834444912.

It can be written as a sum of positive squares in 4 ways, for example, as 18572783524 + 3371660356 = 136282^2 + 58066^2 .

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, 16134941 + ... + 16136300.

Almost surely, 2^21944443880 is an apocalyptic number.

21944443880 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21944443880 is an abundant number, since it is smaller than the sum of its proper divisors (30334968160).

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

21944443880 is a wasteful number, since it uses less digits than its factorization.

21944443880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32271269 (or 32271265 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 47.

The spelling of 21944443880 in words is "twenty-one billion, nine hundred forty-four million, four hundred forty-three thousand, eight hundred eighty".