2123131231 has 8 divisors (see below), whose sum is σ = 2406788720. Its totient is φ = 1856665152.

The previous prime is 2123131229. The next prime is 2123131243. The reversal of 2123131231 is 1321313212.

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

It is a cyclic number.

It is not a de Polignac number, because 2123131231 - 2¹ = 2123131229 is a prime.

It is a super-2 number, since 2×2123131231² = 9015372448095150722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2123131199 and 2123131208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123131211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4297590 + ... + 4298083.

It is an arithmetic number, because the mean of its divisors is an integer number (300848590).

Almost surely, 2^2123131231 is an apocalyptic number.

2123131231 is a deficient number, since it is larger than the sum of its proper divisors (283657489).

2123131231 is a wasteful number, since it uses less digits than its factorization.

2123131231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8595705.

The product of its digits is 216, while the sum is 19.

The square root of 2123131231 is about 46077.4481823809. The cubic root of 2123131231 is about 1285.2638117532.

Adding to 2123131231 its reverse (1321313212), we get a palindrome (3444444443).

The spelling of 2123131231 in words is "two billion, one hundred twenty-three million, one hundred thirty-one thousand, two hundred thirty-one".