21524218120 has 32 divisors (see below), whose sum is σ = 48437685720. Its totient is φ = 8608230400.

The previous prime is 21524218117. The next prime is 21524218139. The reversal of 21524218120 is 2181242512.

It can be written as a sum of positive squares in 4 ways, for example, as 14076873316 + 7447344804 = 118646^2 + 86298^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211770 + ... + 296470.

Almost surely, 2^21524218120 is an apocalyptic number.

21524218120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21524218120 is an abundant number, since it is smaller than the sum of its proper divisors (26913467600).

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

21524218120 is a wasteful number, since it uses less digits than its factorization.

21524218120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91065 (or 91061 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 28.

The spelling of 21524218120 in words is "twenty-one billion, five hundred twenty-four million, two hundred eighteen thousand, one hundred twenty".