231333323221 has 96 divisors (see below), whose sum is σ = 322414114176. Its totient is φ = 163114560000.

The previous prime is 231333323183. The next prime is 231333323233. The reversal of 231333323221 is 122323333132.

It is not a de Polignac number, because 231333323221 - 2¹⁵ = 231333290453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 231333323221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231333323251) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 159429546 + ... + 159430996.

It is an arithmetic number, because the mean of its divisors is an integer number (3358480356).

Almost surely, 2^231333323221 is an apocalyptic number.

It is an amenable number.

231333323221 is a deficient number, since it is larger than the sum of its proper divisors (91080790955).

231333323221 is a wasteful number, since it uses less digits than its factorization.

231333323221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1923 (or 1916 counting only the distinct ones).

The product of its digits is 11664, while the sum is 28.

Adding to 231333323221 its reverse (122323333132), we get a palindrome (353656656353).

The spelling of 231333323221 in words is "two hundred thirty-one billion, three hundred thirty-three million, three hundred twenty-three thousand, two hundred twenty-one".