231342401021 has 2 divisors, whose sum is σ = 231342401022. Its totient is φ = 231342401020.

The previous prime is 231342401011. The next prime is 231342401053. The reversal of 231342401021 is 120104243132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 147291693796 + 84050707225 = 383786^2 + 289915^2 .

It is a cyclic number.

It is not a de Polignac number, because 231342401021 - 2¹⁰ = 231342399997 is a prime.

It is a super-2 number, since 2×231342401021² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231342401011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115671200510 + 115671200511.

It is an arithmetic number, because the mean of its divisors is an integer number (115671200511).

Almost surely, 2^231342401021 is an apocalyptic number.

It is an amenable number.

231342401021 is a deficient number, since it is larger than the sum of its proper divisors (1).

231342401021 is an equidigital number, since it uses as much as digits as its factorization.

231342401021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 23.

Adding to 231342401021 its reverse (120104243132), we get a palindrome (351446644153).

The spelling of 231342401021 in words is "two hundred thirty-one billion, three hundred forty-two million, four hundred one thousand, twenty-one".