21073057884 has 72 divisors (see below), whose sum is σ = 56413768320. Its totient is φ = 6618645792.

The previous prime is 21073057883. The next prime is 21073057903. The reversal of 21073057884 is 48875037012.

21073057884 is a `hidden beast` number, since 2 + 1 + 0 + 73 + 0 + 578 + 8 + 4 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21073057883) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134454 + ... + 245405.

It is an arithmetic number, because the mean of its divisors is an integer number (783524560).

Almost surely, 2^21073057884 is an apocalyptic number.

It is an amenable number.

21073057884 is an abundant number, since it is smaller than the sum of its proper divisors (35340710436).

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

21073057884 is a wasteful number, since it uses less digits than its factorization.

21073057884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379959 (or 379954 counting only the distinct ones).

The product of its (nonzero) digits is 376320, while the sum is 45.

The spelling of 21073057884 in words is "twenty-one billion, seventy-three million, fifty-seven thousand, eight hundred eighty-four".