31220802312 has 64 divisors (see below), whose sum is σ = 89388748800. Its totient is φ = 8901583680.

The previous prime is 31220802271. The next prime is 31220802313. The reversal of 31220802312 is 21320802213.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (31220802313) 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, 113514 + ... + 274457.

It is an arithmetic number, because the mean of its divisors is an integer number (1396699200).

Almost surely, 2^31220802312 is an apocalyptic number.

It is an amenable number.

31220802312 is an abundant number, since it is smaller than the sum of its proper divisors (58167946488).

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

31220802312 is a wasteful number, since it uses less digits than its factorization.

31220802312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388466 (or 388462 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 24.

Subtracting from 31220802312 its reverse (21320802213), we obtain a palindrome (9900000099).

The spelling of 31220802312 in words is "thirty-one billion, two hundred twenty million, eight hundred two thousand, three hundred twelve".