21064311428516 has 12 divisors (see below), whose sum is σ = 36862768519920. Its totient is φ = 10532091851400.

The previous prime is 21064311428507. The next prime is 21064311428551. The reversal of 21064311428516 is 61582411346012.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15219710 + ... + 16545941.

It is an arithmetic number, because the mean of its divisors is an integer number (3071897376660).

Almost surely, 2^{21064311428516} is an apocalyptic number.

It is an amenable number.

21064311428516 is a deficient number, since it is larger than the sum of its proper divisors (15798457091404).

21064311428516 is a wasteful number, since it uses less digits than its factorization.

21064311428516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31931434 (or 31931432 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 44.

The spelling of 21064311428516 in words is "twenty-one trillion, sixty-four billion, three hundred eleven million, four hundred twenty-eight thousand, five hundred sixteen".