231301332221 has 4 divisors (see below), whose sum is σ = 232154842944. Its totient is φ = 230447821500.

The previous prime is 231301332193. The next prime is 231301332271. The reversal of 231301332221 is 122233103132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 231301332221 - 2³⁴ = 214121463037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231301332271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 426754955 + ... + 426755496.

It is an arithmetic number, because the mean of its divisors is an integer number (58038710736).

Almost surely, 2^231301332221 is an apocalyptic number.

It is an amenable number.

231301332221 is a deficient number, since it is larger than the sum of its proper divisors (853510723).

231301332221 is an equidigital number, since it uses as much as digits as its factorization.

231301332221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 853510722.

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

Adding to 231301332221 its reverse (122233103132), we get a palindrome (353534435353).

The spelling of 231301332221 in words is "two hundred thirty-one billion, three hundred one million, three hundred thirty-two thousand, two hundred twenty-one".