21054757896 has 64 divisors (see below), whose sum is σ = 58713163200. Its totient is φ = 6990925824.

The previous prime is 21054757891. The next prime is 21054757937. The reversal of 21054757896 is 69875745012.

21054757896 is a `hidden beast` number, since 2 + 1 + 0 + 547 + 5 + 7 + 8 + 96 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is not an unprimeable number, because it can be changed into a prime (21054757891) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 134130 + ... + 245153.

It is an arithmetic number, because the mean of its divisors is an integer number (917393175).

Almost surely, 2^21054757896 is an apocalyptic number.

It is an amenable number.

21054757896 is an abundant number, since it is smaller than the sum of its proper divisors (37658405304).

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

21054757896 is a wasteful number, since it uses less digits than its factorization.

21054757896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379555 (or 379545 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 54.

The spelling of 21054757896 in words is "twenty-one billion, fifty-four million, seven hundred fifty-seven thousand, eight hundred ninety-six".