2331221231 has 4 divisors (see below), whose sum is σ = 2411608200. Its totient is φ = 2250834264.

The previous prime is 2331221227. The next prime is 2331221267. The reversal of 2331221231 is 1321221332.

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

It is a cyclic number.

It is not a de Polignac number, because 2331221231 - 2² = 2331221227 is a prime.

It is a super-2 number, since 2×2331221231² = 10869184855730310722, 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 (2331227231) 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, 40193441 + ... + 40193498.

It is an arithmetic number, because the mean of its divisors is an integer number (602902050).

Almost surely, 2^2331221231 is an apocalyptic number.

2331221231 is a deficient number, since it is larger than the sum of its proper divisors (80386969).

2331221231 is an equidigital number, since it uses as much as digits as its factorization.

2331221231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80386968.

The product of its digits is 432, while the sum is 20.

The square root of 2331221231 is about 48282.7218681797. The cubic root of 2331221231 is about 1325.9520829620.

Adding to 2331221231 its reverse (1321221332), we get a palindrome (3652442563).

The spelling of 2331221231 in words is "two billion, three hundred thirty-one million, two hundred twenty-one thousand, two hundred thirty-one".