21053937384 has 48 divisors (see below), whose sum is σ = 57384302820. Its totient is φ = 6973274880.

The previous prime is 21053937379. The next prime is 21053937403. The reversal of 21053937384 is 48373935012.

21053937384 is a `hidden beast` number, since 2 + 1 + 0 + 539 + 37 + 3 + 84 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 19734068484 + 1319868900 = 140478^2 + 36330^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 919957 + ... + 942564.

Almost surely, 2^21053937384 is an apocalyptic number.

21053937384 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21053937384 is an abundant number, since it is smaller than the sum of its proper divisors (36330365436).

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

21053937384 is a wasteful number, since it uses less digits than its factorization.

21053937384 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1862690 (or 1862683 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 45.

The spelling of 21053937384 in words is "twenty-one billion, fifty-three million, nine hundred thirty-seven thousand, three hundred eighty-four".