2112131231 has 16 divisors (see below), whose sum is σ = 2465952000. Its totient is φ = 1808322264.

The previous prime is 2112131207. The next prime is 2112131243. The reversal of 2112131231 is 1321312112.

It is not a de Polignac number, because 2112131231 - 2²⁶ = 2045022367 is a prime.

It is a super-2 number, since 2×2112131231² = 8922196673931150722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2112131201) 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, 346496 + ... + 352538.

It is an arithmetic number, because the mean of its divisors is an integer number (154122000).

Almost surely, 2^2112131231 is an apocalyptic number.

2112131231 is a deficient number, since it is larger than the sum of its proper divisors (353820769).

2112131231 is an equidigital number, since it uses as much as digits as its factorization.

2112131231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7083 (or 7069 counting only the distinct ones).

The product of its digits is 72, while the sum is 17.

The square root of 2112131231 is about 45957.9289241802. The cubic root of 2112131231 is about 1283.0403051814.

Adding to 2112131231 its reverse (1321312112), we get a palindrome (3433443343).

The spelling of 2112131231 in words is "two billion, one hundred twelve million, one hundred thirty-one thousand, two hundred thirty-one".