123212131 has 16 divisors (see below), whose sum is σ = 150664960. Its totient is φ = 98405280.

The previous prime is 123212087. The next prime is 123212143. The reversal of 123212131 is 131212321.

It is a cyclic number.

It is not a de Polignac number, because 123212131 - 2⁹ = 123211619 is a prime.

It is a super-2 number, since 2×123212131² = 30362458451122322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123212161) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 520 + ... + 15706.

It is an arithmetic number, because the mean of its divisors is an integer number (9416560).

Almost surely, 2^123212131 is an apocalyptic number.

123212131 is a deficient number, since it is larger than the sum of its proper divisors (27452829).

123212131 is a wasteful number, since it uses less digits than its factorization.

123212131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15274.

The product of its digits is 72, while the sum is 16.

The square root of 123212131 is about 11100.0959905759. The cubic root of 123212131 is about 497.6047182408.

Adding to 123212131 its reverse (131212321), we get a palindrome (254424452).

The spelling of 123212131 in words is "one hundred twenty-three million, two hundred twelve thousand, one hundred thirty-one".