21460205064 has 16 divisors (see below), whose sum is σ = 53650512720. Its totient is φ = 7153401680.

The previous prime is 21460205057. The next prime is 21460205071. The reversal of 21460205064 is 46050206412.

It is an interprime number because it is at equal distance from previous prime (21460205057) and next prime (21460205071).

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 3 ways as a sum of consecutive naturals, for example, 447087582 + ... + 447087629.

It is an arithmetic number, because the mean of its divisors is an integer number (3353157045).

Almost surely, 2^21460205064 is an apocalyptic number.

21460205064 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21460205064 is an abundant number, since it is smaller than the sum of its proper divisors (32190307656).

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

21460205064 is a wasteful number, since it uses less digits than its factorization.

21460205064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 894175220 (or 894175216 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The spelling of 21460205064 in words is "twenty-one billion, four hundred sixty million, two hundred five thousand, sixty-four".