31221022332 has 48 divisors (see below), whose sum is σ = 73206256032. Its totient is φ = 10356034560.

The previous prime is 31221022331. The next prime is 31221022361. The reversal of 31221022332 is 23322012213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31221022299 and 31221022308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31221022331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7762482 + ... + 7766502.

It is an arithmetic number, because the mean of its divisors is an integer number (1525130334).

Almost surely, 2^31221022332 is an apocalyptic number.

It is an amenable number.

31221022332 is an abundant number, since it is smaller than the sum of its proper divisors (41985233700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31221022332 is a wasteful number, since it uses less digits than its factorization.

31221022332 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7038 (or 7036 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 31221022332 its reverse (23322012213), we get a palindrome (54543034545).

The spelling of 31221022332 in words is "thirty-one billion, two hundred twenty-one million, twenty-two thousand, three hundred thirty-two".