21053852520 has 32 divisors (see below), whose sum is σ = 63161557920. Its totient is φ = 5614360640.

The previous prime is 21053852507. The next prime is 21053852531. The reversal of 21053852520 is 2525835012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 87724266 + ... + 87724505.

It is an arithmetic number, because the mean of its divisors is an integer number (1973798685).

Almost surely, 2^21053852520 is an apocalyptic number.

21053852520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21053852520 is an abundant number, since it is smaller than the sum of its proper divisors (42107705400).

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

21053852520 is a wasteful number, since it uses less digits than its factorization.

21053852520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175448785 (or 175448781 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 33.

The spelling of 21053852520 in words is "twenty-one billion, fifty-three million, eight hundred fifty-two thousand, five hundred twenty".