231321111301221 has 4 divisors (see below), whose sum is σ = 308428148401632. Its totient is φ = 154214074200812.

The previous prime is 231321111301187. The next prime is 231321111301277. The reversal of 231321111301221 is 122103111123132.

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 231321111301221 - 2⁶ = 231321111301157 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 231321111301191 and 231321111301200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231321111302221) 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, 38553518550201 + ... + 38553518550206.

It is an arithmetic number, because the mean of its divisors is an integer number (77107037100408).

Almost surely, 2^{231321111301221} is an apocalyptic number.

It is an amenable number.

231321111301221 is a deficient number, since it is larger than the sum of its proper divisors (77107037100411).

231321111301221 is an equidigital number, since it uses as much as digits as its factorization.

231321111301221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77107037100410.

The product of its (nonzero) digits is 432, while the sum is 24.

Adding to 231321111301221 its reverse (122103111123132), we get a palindrome (353424222424353).

The spelling of 231321111301221 in words is "two hundred thirty-one trillion, three hundred twenty-one billion, one hundred eleven million, three hundred one thousand, two hundred twenty-one".