21652416406524 has 12 divisors (see below), whose sum is σ = 50522304948584. Its totient is φ = 7217472135504.

The previous prime is 21652416406493. The next prime is 21652416406541. The reversal of 21652416406524 is 42560461425612.

It is a tau number, because it is divible by the number of its divisors (12).

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, 902184016927 + ... + 902184016950.

Almost surely, 2^{21652416406524} is an apocalyptic number.

It is an amenable number.

21652416406524 is an abundant number, since it is smaller than the sum of its proper divisors (28869888542060).

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

21652416406524 is a wasteful number, since it uses less digits than its factorization.

21652416406524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804368033884 (or 1804368033882 counting only the distinct ones).

The product of its (nonzero) digits is 2764800, while the sum is 48.

The spelling of 21652416406524 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred sixteen million, four hundred six thousand, five hundred twenty-four".