231201023112221 has 4 divisors (see below), whose sum is σ = 231201403025244. Its totient is φ = 231200643199200.

The previous prime is 231201023112193. The next prime is 231201023112223. The reversal of 231201023112221 is 122211320102132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 91849490786596 + 139351532325625 = 9583814^2 + 11804725^2 .

It is a cyclic number.

It is not a de Polignac number, because 231201023112221 - 2¹⁴ = 231201023095837 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 (231201023112223) 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, 189042200 + ... + 190261281.

It is an arithmetic number, because the mean of its divisors is an integer number (57800350756311).

Almost surely, 2^{231201023112221} is an apocalyptic number.

It is an amenable number.

231201023112221 is a deficient number, since it is larger than the sum of its proper divisors (379913023).

231201023112221 is an equidigital number, since it uses as much as digits as its factorization.

231201023112221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379913022.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 231201023112221 its reverse (122211320102132), we get a palindrome (353412343214353).

The spelling of 231201023112221 in words is "two hundred thirty-one trillion, two hundred one billion, twenty-three million, one hundred twelve thousand, two hundred twenty-one".