21651407534716 has 12 divisors (see below), whose sum is σ = 37890291539520. Its totient is φ = 10825609952000.

The previous prime is 21651407534663. The next prime is 21651407534749. The reversal of 21651407534716 is 61743570415612.

It is a congruent number.

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, 22933285 + ... + 23858716.

It is an arithmetic number, because the mean of its divisors is an integer number (3157524294960).

Almost surely, 2^{21651407534716} is an apocalyptic number.

It is an amenable number.

21651407534716 is a deficient number, since it is larger than the sum of its proper divisors (16238884004804).

21651407534716 is a wasteful number, since it uses less digits than its factorization.

21651407534716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46907684 (or 46907682 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 52.

The spelling of 21651407534716 in words is "twenty-one trillion, six hundred fifty-one billion, four hundred seven million, five hundred thirty-four thousand, seven hundred sixteen".