2123345231 has 4 divisors (see below), whose sum is σ = 2426680272. Its totient is φ = 1820010192.

The previous prime is 2123345207. The next prime is 2123345251. The reversal of 2123345231 is 1325433212.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2123345231 - 2¹⁸ = 2123083087 is a prime.

It is a super-2 number, since 2×2123345231² = 9017189940020886722, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2123345231.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123345251) 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, 151667510 + ... + 151667523.

It is an arithmetic number, because the mean of its divisors is an integer number (606670068).

Almost surely, 2^2123345231 is an apocalyptic number.

2123345231 is a deficient number, since it is larger than the sum of its proper divisors (303335041).

2123345231 is an equidigital number, since it uses as much as digits as its factorization.

2123345231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303335040.

The product of its digits is 4320, while the sum is 26.

The square root of 2123345231 is about 46079.7703010768. The cubic root of 2123345231 is about 1285.3069928201.

Adding to 2123345231 its reverse (1325433212), we get a palindrome (3448778443).

The spelling of 2123345231 in words is "two billion, one hundred twenty-three million, three hundred forty-five thousand, two hundred thirty-one".