231220330331 has 16 divisors (see below), whose sum is σ = 241176592800. Its totient is φ = 221402995968.

The previous prime is 231220330277. The next prime is 231220330337. The reversal of 231220330331 is 133033022132.

It is a cyclic number.

It is not a de Polignac number, because 231220330331 - 2⁶ = 231220330267 is a prime.

It is a super-2 number, since 2×231220330331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231220330297 and 231220330306.

It is not an unprimeable number, because it can be changed into a prime (231220330337) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1876535 + ... + 1995951.

It is an arithmetic number, because the mean of its divisors is an integer number (15073537050).

Almost surely, 2^231220330331 is an apocalyptic number.

231220330331 is a deficient number, since it is larger than the sum of its proper divisors (9956262469).

231220330331 is a wasteful number, since it uses less digits than its factorization.

231220330331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119998.

The product of its (nonzero) digits is 1944, while the sum is 23.

Adding to 231220330331 its reverse (133033022132), we get a palindrome (364253352463).

The spelling of 231220330331 in words is "two hundred thirty-one billion, two hundred twenty million, three hundred thirty thousand, three hundred thirty-one".