2131121231 has 8 divisors (see below), whose sum is σ = 2221441200. Its totient is φ = 2041923520.

The previous prime is 2131121221. The next prime is 2131121249. The reversal of 2131121231 is 1321211312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2131121231 is a prime.

It is a super-2 number, since 2×2131121231² = 9083355402437910722, 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 (2131121221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 276686 + ... + 284283.

It is an arithmetic number, because the mean of its divisors is an integer number (277680150).

Almost surely, 2^2131121231 is an apocalyptic number.

2131121231 is a deficient number, since it is larger than the sum of its proper divisors (90319969).

2131121231 is a wasteful number, since it uses less digits than its factorization.

2131121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561129.

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

The square root of 2131121231 is about 46164.0686140206. The cubic root of 2131121231 is about 1286.8740753174.

Adding to 2131121231 its reverse (1321211312), we get a palindrome (3452332543).

The spelling of 2131121231 in words is "two billion, one hundred thirty-one million, one hundred twenty-one thousand, two hundred thirty-one".