231220301324321 has 4 divisors (see below), whose sum is σ = 232751561598144. Its totient is φ = 229689041050500.

The previous prime is 231220301324279. The next prime is 231220301324381. The reversal of 231220301324321 is 123423103022132.

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 a de Polignac number, because none of the positive numbers 2^k-231220301324321 is a prime.

It is a super-2 number, since 2×231220301324321² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231220301324381) 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, 765630136685 + ... + 765630136986.

It is an arithmetic number, because the mean of its divisors is an integer number (58187890399536).

Almost surely, 2^{231220301324321} is an apocalyptic number.

It is an amenable number.

231220301324321 is a deficient number, since it is larger than the sum of its proper divisors (1531260273823).

231220301324321 is a wasteful number, since it uses less digits than its factorization.

231220301324321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1531260273822.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 231220301324321 its reverse (123423103022132), we get a palindrome (354643404346453).

The spelling of 231220301324321 in words is "two hundred thirty-one trillion, two hundred twenty billion, three hundred one million, three hundred twenty-four thousand, three hundred twenty-one".