22636121 has 4 divisors (see below), whose sum is σ = 22647012. Its totient is φ = 22625232.

The previous prime is 22636111. The next prime is 22636123. The reversal of 22636121 is 12163622.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12163622 = 2 ⋅6081811.

It can be written as a sum of positive squares in 2 ways, for example, as 13424896 + 9211225 = 3664^2 + 3035^2 .

It is a cyclic number.

It is not a de Polignac number, because 22636121 - 2⁶ = 22636057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22636123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1250 + ... + 6843.

It is an arithmetic number, because the mean of its divisors is an integer number (5661753).

Almost surely, 2^22636121 is an apocalyptic number.

It is an amenable number.

22636121 is a deficient number, since it is larger than the sum of its proper divisors (10891).

22636121 is an equidigital number, since it uses as much as digits as its factorization.

22636121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10890.

The product of its digits is 864, while the sum is 23.

The square root of 22636121 is about 4757.7432675587. The cubic root of 22636121 is about 282.8789745006.

Adding to 22636121 its reverse (12163622), we get a palindrome (34799743).

The spelling of 22636121 in words is "twenty-two million, six hundred thirty-six thousand, one hundred twenty-one".