231212113121 has 4 divisors (see below), whose sum is σ = 252231396144. Its totient is φ = 210192830100.

The previous prime is 231212113103. The next prime is 231212113127. The reversal of 231212113121 is 121311212132.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 231212113121 - 2¹⁰ = 231212112097 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 231212113093 and 231212113102.

It is not an unprimeable number, because it can be changed into a prime (231212113127) 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, 10509641495 + ... + 10509641516.

It is an arithmetic number, because the mean of its divisors is an integer number (63057849036).

Almost surely, 2^231212113121 is an apocalyptic number.

It is an amenable number.

231212113121 is a deficient number, since it is larger than the sum of its proper divisors (21019283023).

231212113121 is a wasteful number, since it uses less digits than its factorization.

231212113121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21019283022.

The product of its digits is 144, while the sum is 20.

Adding to 231212113121 its reverse (121311212132), we get a palindrome (352523325253).

The spelling of 231212113121 in words is "two hundred thirty-one billion, two hundred twelve million, one hundred thirteen thousand, one hundred twenty-one".