12213131 has 4 divisors (see below), whose sum is σ = 13957872. Its totient is φ = 10468392.

The previous prime is 12213127. The next prime is 12213137. The reversal of 12213131 is 13131221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 13131221 = 149 ⋅88129.

It is a cyclic number.

It is not a de Polignac number, because 12213131 - 2² = 12213127 is a prime.

It is a super-2 number, since 2×12213131² = 298321137646322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12213137) 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, 872360 + ... + 872373.

It is an arithmetic number, because the mean of its divisors is an integer number (3489468).

Almost surely, 2^12213131 is an apocalyptic number.

12213131 is a deficient number, since it is larger than the sum of its proper divisors (1744741).

12213131 is an equidigital number, since it uses as much as digits as its factorization.

12213131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744740.

The product of its digits is 36, while the sum is 14.

The square root of 12213131 is about 3494.7290309837. The cubic root of 12213131 is about 230.2903139309.

Adding to 12213131 its reverse (13131221), we get a palindrome (25344352).

The spelling of 12213131 in words is "twelve million, two hundred thirteen thousand, one hundred thirty-one".