231030122021 has 2 divisors, whose sum is σ = 231030122022. Its totient is φ = 231030122020.

The previous prime is 231030121981. The next prime is 231030122053. The reversal of 231030122021 is 120221030132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 216933309121 + 14096812900 = 465761^2 + 118730^2 .

It is a cyclic number.

It is not a de Polignac number, because 231030122021 - 2³⁰ = 229956380197 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231030122221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115515061010 + 115515061011.

It is an arithmetic number, because the mean of its divisors is an integer number (115515061011).

Almost surely, 2^231030122021 is an apocalyptic number.

It is an amenable number.

231030122021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231030122021 is an equidigital number, since it uses as much as digits as its factorization.

231030122021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 231030122021 its reverse (120221030132), we get a palindrome (351251152153).

The spelling of 231030122021 in words is "two hundred thirty-one billion, thirty million, one hundred twenty-two thousand, twenty-one".