2312331221 has 4 divisors (see below), whose sum is σ = 2315939244. Its totient is φ = 2308723200.

The previous prime is 2312331139. The next prime is 2312331227. The reversal of 2312331221 is 1221332132.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1620062500 + 692268721 = 40250^2 + 26311^2 .

It is a cyclic number.

It is not a de Polignac number, because 2312331221 - 2¹⁸ = 2312069077 is a prime.

It is a super-2 number, since 2×2312331221² = 10693751351222701682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2312331193 and 2312331202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2312331227) 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 3 ways as a sum of consecutive naturals, for example, 1803050 + ... + 1804331.

It is an arithmetic number, because the mean of its divisors is an integer number (578984811).

Almost surely, 2^2312331221 is an apocalyptic number.

It is an amenable number.

2312331221 is a deficient number, since it is larger than the sum of its proper divisors (3608023).

2312331221 is an equidigital number, since it uses as much as digits as its factorization.

2312331221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3608022.

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

The square root of 2312331221 is about 48086.7052416778. The cubic root of 2312331221 is about 1322.3609455439.

Adding to 2312331221 its reverse (1221332132), we get a palindrome (3533663353).

The spelling of 2312331221 in words is "two billion, three hundred twelve million, three hundred thirty-one thousand, two hundred twenty-one".