21662641154161 has 32 divisors (see below), whose sum is σ = 25504335360000. Its totient is φ = 18013016131200.

The previous prime is 21662641154149. The next prime is 21662641154191. The reversal of 21662641154161 is 16145114626612.

It is a cyclic number.

It is not a de Polignac number, because 21662641154161 - 2²⁹ = 21662104283249 is a prime.

It is a super-2 number, since 2×21662641154161² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21662641154101) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52630840 + ... + 53040838.

It is an arithmetic number, because the mean of its divisors is an integer number (797010480000).

Almost surely, 2^{21662641154161} is an apocalyptic number.

It is an amenable number.

21662641154161 is a deficient number, since it is larger than the sum of its proper divisors (3841694205839).

21662641154161 is a wasteful number, since it uses less digits than its factorization.

21662641154161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411085.

The product of its digits is 414720, while the sum is 46.

The spelling of 21662641154161 in words is "twenty-one trillion, six hundred sixty-two billion, six hundred forty-one million, one hundred fifty-four thousand, one hundred sixty-one".