21431064800 has 72 divisors (see below), whose sum is σ = 52949095416. Its totient is φ = 8469117440.

The previous prime is 21431064797. The next prime is 21431064829. The reversal of 21431064800 is 846013412.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 94979 + ... + 227778.

It is an arithmetic number, because the mean of its divisors is an integer number (735404103).

Almost surely, 2^21431064800 is an apocalyptic number.

21431064800 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21431064800 is an abundant number, since it is smaller than the sum of its proper divisors (31518030616).

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

21431064800 is a wasteful number, since it uses less digits than its factorization.

21431064800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 322860 (or 322847 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The spelling of 21431064800 in words is "twenty-one billion, four hundred thirty-one million, sixty-four thousand, eight hundred".