21513042560 has 64 divisors (see below), whose sum is σ = 52301397600. Its totient is φ = 8459351040.

The previous prime is 21513042559. The next prime is 21513042587. The reversal of 21513042560 is 6524031512.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×21513042560² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 247106 + ... + 322625.

Almost surely, 2^21513042560 is an apocalyptic number.

21513042560 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21513042560 is an abundant number, since it is smaller than the sum of its proper divisors (30788355040).

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

21513042560 is an equidigital number, since it uses as much as digits as its factorization.

21513042560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569809 (or 569797 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The spelling of 21513042560 in words is "twenty-one billion, five hundred thirteen million, forty-two thousand, five hundred sixty".