31220012232 has 96 divisors (see below), whose sum is σ = 85522465080. Its totient is φ = 10287820800.

The previous prime is 31220012141. The next prime is 31220012249. The reversal of 31220012232 is 23221002213.

31220012232 is a `hidden beast` number, since 312 + 200 + 122 + 32 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 24203269476 + 7016742756 = 155574^2 + 83766^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

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 23 ways as a sum of consecutive naturals, for example, 5327448 + ... + 5333304.

Almost surely, 2^31220012232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31220012232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42761232540).

31220012232 is an abundant number, since it is smaller than the sum of its proper divisors (54302452848).

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

31220012232 is a wasteful number, since it uses less digits than its factorization.

31220012232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6703 (or 6696 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

Adding to 31220012232 its reverse (23221002213), we get a palindrome (54441014445).

The spelling of 31220012232 in words is "thirty-one billion, two hundred twenty million, twelve thousand, two hundred thirty-two".