31312202112 has 96 divisors (see below), whose sum is σ = 90412620480. Its totient is φ = 10401666048.

The previous prime is 31312202111. The next prime is 31312202137. The reversal of 31312202112 is 21120221313.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×31312202112² (a number of 22 digits) contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31312202111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 291153 + ... + 383919.

It is an arithmetic number, because the mean of its divisors is an integer number (941798130).

Almost surely, 2^31312202112 is an apocalyptic number.

31312202112 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31312202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45206310240).

31312202112 is an abundant number, since it is smaller than the sum of its proper divisors (59100418368).

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

31312202112 is a wasteful number, since it uses less digits than its factorization.

31312202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93080 (or 93065 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 31312202112 its reverse (21120221313), we get a palindrome (52432423425).

The spelling of 31312202112 in words is "thirty-one billion, three hundred twelve million, two hundred two thousand, one hundred twelve".