231223132121 has 4 divisors (see below), whose sum is σ = 244824492852. Its totient is φ = 217621771392.

The previous prime is 231223132097. The next prime is 231223132139. The reversal of 231223132121 is 121231322132.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 120825760000 + 110397372121 = 347600^2 + 332261^2 .

It is a cyclic number.

It is not a de Polignac number, because 231223132121 - 2³⁰ = 230149390297 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (231223132141) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6800680340 + ... + 6800680373.

It is an arithmetic number, because the mean of its divisors is an integer number (61206123213).

Almost surely, 2^231223132121 is an apocalyptic number.

It is an amenable number.

231223132121 is a deficient number, since it is larger than the sum of its proper divisors (13601360731).

231223132121 is a wasteful number, since it uses less digits than its factorization.

231223132121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13601360730.

The product of its digits is 864, while the sum is 23.

Adding to 231223132121 its reverse (121231322132), we get a palindrome (352454454253).

The spelling of 231223132121 in words is "two hundred thirty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-one".