21616121656602 has 96 divisors (see below), whose sum is σ = 53315706802176. Its totient is φ = 6265350247200.

The previous prime is 21616121656531. The next prime is 21616121656603. The reversal of 21616121656602 is 20665612161612.

21616121656602 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 61 + 21 + 6 + 566 + 0 + 2 = 666.

It is not an unprimeable number, because it can be changed into a prime (21616121656603) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 224113327 + ... + 224209757.

It is an arithmetic number, because the mean of its divisors is an integer number (555371945856).

Almost surely, 2^{21616121656602} is an apocalyptic number.

21616121656602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21616121656602 is an abundant number, since it is smaller than the sum of its proper divisors (31699585145574).

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

21616121656602 is a wasteful number, since it uses less digits than its factorization.

21616121656602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145696 (or 145693 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The spelling of 21616121656602 in words is "twenty-one trillion, six hundred sixteen billion, one hundred twenty-one million, six hundred fifty-six thousand, six hundred two".