21616216510524 has 384 divisors, whose sum is σ = 54418932836352. Its totient is φ = 6668724142080.

The previous prime is 21616216510507. The next prime is 21616216510529. The reversal of 21616216510524 is 42501561261612.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21616216510529) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 42974585257 + ... + 42974585759.

It is an arithmetic number, because the mean of its divisors is an integer number (141715970928).

Almost surely, 2^{21616216510524} is an apocalyptic number.

It is an amenable number.

21616216510524 is an abundant number, since it is smaller than the sum of its proper divisors (32802716325828).

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

21616216510524 is a wasteful number, since it uses less digits than its factorization.

21616216510524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1045 (or 1043 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21616216510524 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixteen million, five hundred ten thousand, five hundred twenty-four".