231423423221 has 2 divisors, whose sum is σ = 231423423222. Its totient is φ = 231423423220.

The previous prime is 231423423193. The next prime is 231423423223. The reversal of 231423423221 is 122324324132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 194564799025 + 36858624196 = 441095^2 + 191986^2 .

It is a cyclic number.

It is not a de Polignac number, because 231423423221 - 2⁶ = 231423423157 is a prime.

Together with 231423423223, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (231423423223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115711711610 + 115711711611.

It is an arithmetic number, because the mean of its divisors is an integer number (115711711611).

Almost surely, 2^231423423221 is an apocalyptic number.

It is an amenable number.

231423423221 is a deficient number, since it is larger than the sum of its proper divisors (1).

231423423221 is an equidigital number, since it uses as much as digits as its factorization.

231423423221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 29.

Adding to 231423423221 its reverse (122324324132), we get a palindrome (353747747353).

The spelling of 231423423221 in words is "two hundred thirty-one billion, four hundred twenty-three million, four hundred twenty-three thousand, two hundred twenty-one".