21612403464 has 64 divisors (see below), whose sum is σ = 54432181440. Its totient is φ = 7150798080.

The previous prime is 21612403447. The next prime is 21612403471. The reversal of 21612403464 is 46430421612.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2441254 + ... + 2450090.

It is an arithmetic number, because the mean of its divisors is an integer number (850502835).

Almost surely, 2^21612403464 is an apocalyptic number.

21612403464 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21612403464 is an abundant number, since it is smaller than the sum of its proper divisors (32819777976).

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

21612403464 is a wasteful number, since it uses less digits than its factorization.

21612403464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9590 (or 9586 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 21612403464 in words is "twenty-one billion, six hundred twelve million, four hundred three thousand, four hundred sixty-four".