231212223133121 has 8 divisors (see below), whose sum is σ = 231360169298664. Its totient is φ = 231064314157440.

The previous prime is 231212223133069. The next prime is 231212223133153. The reversal of 231212223133121 is 121331322212132.

It can be written as a sum of positive squares in 4 ways, for example, as 10496304040000 + 220715919093121 = 3239800^2 + 14856511^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 231212223133121 - 2³⁸ = 230937345226177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231212223135121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3145991 + ... + 21732963.

It is an arithmetic number, because the mean of its divisors is an integer number (28920021162333).

Almost surely, 2^{231212223133121} is an apocalyptic number.

It is an amenable number.

231212223133121 is a deficient number, since it is larger than the sum of its proper divisors (147946165543).

231212223133121 is a wasteful number, since it uses less digits than its factorization.

231212223133121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18594931.

The product of its digits is 5184, while the sum is 29.

Adding to 231212223133121 its reverse (121331322212132), we get a palindrome (352543545345253).

The spelling of 231212223133121 in words is "two hundred thirty-one trillion, two hundred twelve billion, two hundred twenty-three million, one hundred thirty-three thousand, one hundred twenty-one".