31222202312 has 64 divisors (see below), whose sum is σ = 70884616320. Its totient is φ = 12585950208.

The previous prime is 31222202303. The next prime is 31222202369. The reversal of 31222202312 is 21320222213.

It is a happy number.

It is a super-2 number, since 2×31222202312² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1653758 + ... + 1672530.

It is an arithmetic number, because the mean of its divisors is an integer number (1107572130).

Almost surely, 2^31222202312 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 31222202312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35442308160).

31222202312 is an abundant number, since it is smaller than the sum of its proper divisors (39662414008).

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

31222202312 is a wasteful number, since it uses less digits than its factorization.

31222202312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20550 (or 20546 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 31222202312 its reverse (21320222213), we get a palindrome (52542424525).

The spelling of 31222202312 in words is "thirty-one billion, two hundred twenty-two million, two hundred two thousand, three hundred twelve".