231301222021 has 2 divisors, whose sum is σ = 231301222022. Its totient is φ = 231301222020.

The previous prime is 231301221967. The next prime is 231301222027. The reversal of 231301222021 is 120222103132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 231178256100 + 122965921 = 480810^2 + 11089^2 .

It is a cyclic number.

It is not a de Polignac number, because 231301222021 - 2⁹ = 231301221509 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231301222021.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231301222027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115650611010 + 115650611011.

It is an arithmetic number, because the mean of its divisors is an integer number (115650611011).

Almost surely, 2^231301222021 is an apocalyptic number.

It is an amenable number.

231301222021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231301222021 is an equidigital number, since it uses as much as digits as its factorization.

231301222021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 231301222021 its reverse (120222103132), we get a palindrome (351523325153).

The spelling of 231301222021 in words is "two hundred thirty-one billion, three hundred one million, two hundred twenty-two thousand, twenty-one".