22121131 has 4 divisors (see below), whose sum is σ = 23422392. Its totient is φ = 20819872.

The previous prime is 22121089. The next prime is 22121137. The reversal of 22121131 is 13112122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13112122 = 2 ⋅6556061.

It is a cyclic number.

It is not a de Polignac number, because 22121131 - 2⁷ = 22121003 is a prime.

It is a super-2 number, since 2×22121131² = 978688873438322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22121137) 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, 650605 + ... + 650638.

It is an arithmetic number, because the mean of its divisors is an integer number (5855598).

Almost surely, 2^22121131 is an apocalyptic number.

22121131 is a deficient number, since it is larger than the sum of its proper divisors (1301261).

22121131 is a wasteful number, since it uses less digits than its factorization.

22121131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301260.

The product of its digits is 24, while the sum is 13.

The square root of 22121131 is about 4703.3106425155. The cubic root of 22121131 is about 280.7172554781.

Adding to 22121131 its reverse (13112122), we get a palindrome (35233253).

Subtracting from 22121131 its reverse (13112122), we obtain a palindrome (9009009).

The spelling of 22121131 in words is "twenty-two million, one hundred twenty-one thousand, one hundred thirty-one".