22161324161 has 4 divisors (see below), whose sum is σ = 22376482752. Its totient is φ = 21946165572.

The previous prime is 22161324149. The next prime is 22161324179. The reversal of 22161324161 is 16142316122.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16142316122 = 2 ⋅8071158061.

It is a cyclic number.

It is not a de Polignac number, because 22161324161 - 2¹⁸ = 22161062017 is a prime.

It is a super-2 number, since 2×22161324161² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22161324191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 107579141 + ... + 107579346.

It is an arithmetic number, because the mean of its divisors is an integer number (5594120688).

Almost surely, 2^22161324161 is an apocalyptic number.

It is an amenable number.

22161324161 is a deficient number, since it is larger than the sum of its proper divisors (215158591).

22161324161 is a wasteful number, since it uses less digits than its factorization.

22161324161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215158590.

The product of its digits is 3456, while the sum is 29.

The spelling of 22161324161 in words is "twenty-two billion, one hundred sixty-one million, three hundred twenty-four thousand, one hundred sixty-one".