21536077224 has 32 divisors (see below), whose sum is σ = 57007264320. Its totient is φ = 6756416256.

The previous prime is 21536077169. The next prime is 21536077229. The reversal of 21536077224 is 42277063512.

It is not an unprimeable number, because it can be changed into a prime (21536077229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26391844 + ... + 26392659.

It is an arithmetic number, because the mean of its divisors is an integer number (1781477010).

Almost surely, 2^21536077224 is an apocalyptic number.

21536077224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21536077224 is an abundant number, since it is smaller than the sum of its proper divisors (35471187096).

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

21536077224 is a wasteful number, since it uses less digits than its factorization.

21536077224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52784529 (or 52784525 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 39.

The spelling of 21536077224 in words is "twenty-one billion, five hundred thirty-six million, seventy-seven thousand, two hundred twenty-four".