231223212321 has 4 divisors (see below), whose sum is σ = 308297616432. Its totient is φ = 154148808212.

The previous prime is 231223212317. The next prime is 231223212343. The reversal of 231223212321 is 123212322132.

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 231223212321 - 2² = 231223212317 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231223212291 and 231223212300.

It is not an unprimeable number, because it can be changed into a prime (231223212391) 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, 38537202051 + ... + 38537202056.

It is an arithmetic number, because the mean of its divisors is an integer number (77074404108).

Almost surely, 2^231223212321 is an apocalyptic number.

It is an amenable number.

231223212321 is a deficient number, since it is larger than the sum of its proper divisors (77074404111).

231223212321 is an equidigital number, since it uses as much as digits as its factorization.

231223212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77074404110.

The product of its digits is 1728, while the sum is 24.

Adding to 231223212321 its reverse (123212322132), we get a palindrome (354435534453).

The spelling of 231223212321 in words is "two hundred thirty-one billion, two hundred twenty-three million, two hundred twelve thousand, three hundred twenty-one".