31312233103212 has 240 divisors, whose sum is σ = 84613540001760. Its totient is φ = 10091807511552.

The previous prime is 31312233103157. The next prime is 31312233103213. The reversal of 31312233103212 is 21230133221313.

31312233103212 is a `hidden beast` number, since 3 + 1 + 3 + 1 + 2 + 2 + 331 + 0 + 321 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (31312233103213) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1608302614 + ... + 1608322082.

It is an arithmetic number, because the mean of its divisors is an integer number (352556416674).

Almost surely, 2^{31312233103212} 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 31312233103212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42306770000880).

31312233103212 is an abundant number, since it is smaller than the sum of its proper divisors (53301306898548).

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

31312233103212 is a wasteful number, since it uses less digits than its factorization.

31312233103212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20894 (or 20883 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 27.

Adding to 31312233103212 its reverse (21230133221313), we get a palindrome (52542366324525).

The spelling of 31312233103212 in words is "thirty-one trillion, three hundred twelve billion, two hundred thirty-three million, one hundred three thousand, two hundred twelve".