231031221321 has 8 divisors (see below), whose sum is σ = 308046322080. Its totient is φ = 154018467392.

The previous prime is 231031221251. The next prime is 231031221359. The reversal of 231031221321 is 123122130132.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231031221321 - 2²⁹ = 230494350409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (231031221391) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 342480 + ... + 761153.

It is an arithmetic number, because the mean of its divisors is an integer number (38505790260).

Almost surely, 2^231031221321 is an apocalyptic number.

It is an amenable number.

231031221321 is a deficient number, since it is larger than the sum of its proper divisors (77015100759).

231031221321 is a wasteful number, since it uses less digits than its factorization.

231031221321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1173415.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 231031221321 its reverse (123122130132), we get a palindrome (354153351453).

The spelling of 231031221321 in words is "two hundred thirty-one billion, thirty-one million, two hundred twenty-one thousand, three hundred twenty-one".