31221033132 has 24 divisors (see below), whose sum is σ = 72926030016. Its totient is φ = 10396017808.

The previous prime is 31221033097. The next prime is 31221033163. The reversal of 31221033132 is 23133012213.

It is a junction number, because it is equal to n+sod(n) for n = 31221033099 and 31221033108.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362318 + ... + 1385045.

It is an arithmetic number, because the mean of its divisors is an integer number (3038584584).

Almost surely, 2^31221033132 is an apocalyptic number.

It is an amenable number.

31221033132 is an abundant number, since it is smaller than the sum of its proper divisors (41704996884).

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

31221033132 is a wasteful number, since it uses less digits than its factorization.

31221033132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748317 (or 2748315 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 31221033132 its reverse (23133012213), we get a palindrome (54354045345).

The spelling of 31221033132 in words is "thirty-one billion, two hundred twenty-one million, thirty-three thousand, one hundred thirty-two".