231221323132 has 12 divisors (see below), whose sum is σ = 404758234440. Its totient is φ = 115576113296.

The previous prime is 231221323079. The next prime is 231221323153. The reversal of 231221323132 is 231323122132.

231221323132 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 231221323097 and 231221323106.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8622007 + ... + 8648782.

It is an arithmetic number, because the mean of its divisors is an integer number (33729852870).

Almost surely, 2^231221323132 is an apocalyptic number.

It is an amenable number.

231221323132 is a deficient number, since it is larger than the sum of its proper divisors (173536911308).

231221323132 is a wasteful number, since it uses less digits than its factorization.

231221323132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17274140 (or 17274138 counting only the distinct ones).

The product of its digits is 2592, while the sum is 25.

Adding to 231221323132 its reverse (231323122132), we get a palindrome (462544445264).

The spelling of 231221323132 in words is "two hundred thirty-one billion, two hundred twenty-one million, three hundred twenty-three thousand, one hundred thirty-two".