21616051042161 has 20 divisors (see below), whose sum is σ = 32374953971712. Its totient is φ = 14373074823768.

The previous prime is 21616051042153. The next prime is 21616051042217. The reversal of 21616051042161 is 16124015061612.

21616051042161 is a `hidden beast` number, since 2 + 1 + 6 + 1 + 60 + 510 + 4 + 21 + 61 = 666.

It is not a de Polignac number, because 21616051042161 - 2³ = 21616051042153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21616051041161) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 348356481 + ... + 348418526.

Almost surely, 2^{21616051042161} is an apocalyptic number.

It is an amenable number.

21616051042161 is a deficient number, since it is larger than the sum of its proper divisors (10758902929551).

21616051042161 is an equidigital number, since it uses as much as digits as its factorization.

21616051042161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696775402 (or 696775393 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The spelling of 21616051042161 in words is "twenty-one trillion, six hundred sixteen billion, fifty-one million, forty-two thousand, one hundred sixty-one".