21464607580 has 24 divisors (see below), whose sum is σ = 48543036192. Its totient is φ = 7925393472.

The previous prime is 21464607509. The next prime is 21464607599. The reversal of 21464607580 is 8570646412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41277832 + ... + 41278351.

It is an arithmetic number, because the mean of its divisors is an integer number (2022626508).

Almost surely, 2^21464607580 is an apocalyptic number.

21464607580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21464607580 is an abundant number, since it is smaller than the sum of its proper divisors (27078428612).

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

21464607580 is a wasteful number, since it uses less digits than its factorization.

21464607580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 82556205 (or 82556203 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 43.

The spelling of 21464607580 in words is "twenty-one billion, four hundred sixty-four million, six hundred seven thousand, five hundred eighty".