231033220212121 has 4 divisors (see below), whose sum is σ = 243192863381200. Its totient is φ = 218873577043044.

The previous prime is 231033220212079. The next prime is 231033220212143. The reversal of 231033220212121 is 121212022330132.

231033220212121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 a cyclic number.

It is not a de Polignac number, because 231033220212121 - 2¹¹ = 231033220210073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (231033220212191) 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, 6079821584511 + ... + 6079821584548.

It is an arithmetic number, because the mean of its divisors is an integer number (60798215845300).

Almost surely, 2^{231033220212121} is an apocalyptic number.

It is an amenable number.

231033220212121 is a deficient number, since it is larger than the sum of its proper divisors (12159643169079).

231033220212121 is a wasteful number, since it uses less digits than its factorization.

231033220212121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12159643169078.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 231033220212121 its reverse (121212022330132), we get a palindrome (352245242542253).

The spelling of 231033220212121 in words is "two hundred thirty-one trillion, thirty-three billion, two hundred twenty million, two hundred twelve thousand, one hundred twenty-one".