231552214121 has 2 divisors, whose sum is σ = 231552214122. Its totient is φ = 231552214120.

The previous prime is 231552214111. The next prime is 231552214247. The reversal of 231552214121 is 121412255132.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 152022010000 + 79530204121 = 389900^2 + 282011^2 .

It is a cyclic number.

It is not a de Polignac number, because 231552214121 - 2¹⁸ = 231551951977 is a prime.

It is not a weakly prime, because it can be changed into another prime (231552214111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 115776107060 + 115776107061.

It is an arithmetic number, because the mean of its divisors is an integer number (115776107061).

Almost surely, 2^231552214121 is an apocalyptic number.

It is an amenable number.

231552214121 is a deficient number, since it is larger than the sum of its proper divisors (1).

231552214121 is an equidigital number, since it uses as much as digits as its factorization.

231552214121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4800, while the sum is 29.

Adding to 231552214121 its reverse (121412255132), we get a palindrome (352964469253).

The spelling of 231552214121 in words is "two hundred thirty-one billion, five hundred fifty-two million, two hundred fourteen thousand, one hundred twenty-one".