23221131 has 4 divisors (see below), whose sum is σ = 30961512. Its totient is φ = 15480752.

The previous prime is 23221123. The next prime is 23221147. The reversal of 23221131 is 13112232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23221131 - 2³ = 23221123 is a prime.

It is a super-2 number, since 2×23221131² = 1078441849838322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 23221131.

It is not an unprimeable number, because it can be changed into a prime (23221151) 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, 3870186 + ... + 3870191.

It is an arithmetic number, because the mean of its divisors is an integer number (7740378).

Almost surely, 2^23221131 is an apocalyptic number.

23221131 is a deficient number, since it is larger than the sum of its proper divisors (7740381).

23221131 is an equidigital number, since it uses as much as digits as its factorization.

23221131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7740380.

The product of its digits is 72, while the sum is 15.

The square root of 23221131 is about 4818.8308748077. The cubic root of 23221131 is about 285.2951942951.

Adding to 23221131 its reverse (13112232), we get a palindrome (36333363).

The spelling of 23221131 in words is "twenty-three million, two hundred twenty-one thousand, one hundred thirty-one".