21616216436620 has 24 divisors (see below), whose sum is σ = 48885904864944. Its totient is φ = 7981372222656.

The previous prime is 21616216436611. The next prime is 21616216436653. The reversal of 21616216436620 is 2663461261612.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41569646734 + ... + 41569647253.

It is an arithmetic number, because the mean of its divisors is an integer number (2036912702706).

Almost surely, 2^{21616216436620} is an apocalyptic number.

21616216436620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21616216436620 is an abundant number, since it is smaller than the sum of its proper divisors (27269688428324).

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

21616216436620 is a wasteful number, since it uses less digits than its factorization.

21616216436620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83139294009 (or 83139294007 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 46.

The spelling of 21616216436620 in words is "twenty-one trillion, six hundred sixteen billion, two hundred sixteen million, four hundred thirty-six thousand, six hundred twenty".