231221213332 has 12 divisors (see below), whose sum is σ = 404686653280. Its totient is φ = 115596455256.

The previous prime is 231221213287. The next prime is 231221213339. The reversal of 231221213332 is 233312122132.

It is a junction number, because it is equal to n+sod(n) for n = 231221213297 and 231221213306.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (231221213339) 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, 3501048 + ... + 3566479.

Almost surely, 2^231221213332 is an apocalyptic number.

It is an amenable number.

231221213332 is a deficient number, since it is larger than the sum of its proper divisors (173465439948).

231221213332 is a wasteful number, since it uses less digits than its factorization.

231221213332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7075710 (or 7075708 counting only the distinct ones).

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

Adding to 231221213332 its reverse (233312122132), we get a palindrome (464533335464).

The spelling of 231221213332 in words is "two hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, three hundred thirty-two".