231221303231 has 4 divisors (see below), whose sum is σ = 231317688000. Its totient is φ = 231124918464.

The previous prime is 231221303191. The next prime is 231221303267. The reversal of 231221303231 is 132303122132.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-231221303231 is a prime.

It is a super-2 number, since 2×231221303231² (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 = 231221303197 and 231221303206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221323231) 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, 48188786 + ... + 48193583.

It is an arithmetic number, because the mean of its divisors is an integer number (57829422000).

Almost surely, 2^231221303231 is an apocalyptic number.

231221303231 is a deficient number, since it is larger than the sum of its proper divisors (96384769).

231221303231 is an equidigital number, since it uses as much as digits as its factorization.

231221303231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96384768.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 231221303231 its reverse (132303122132), we get a palindrome (363524425363).

The spelling of 231221303231 in words is "two hundred thirty-one billion, two hundred twenty-one million, three hundred three thousand, two hundred thirty-one".