31200313212 has 120 divisors (see below), whose sum is σ = 87312825600. Its totient is φ = 9685622304.

The previous prime is 31200313189. The next prime is 31200313219. The reversal of 31200313212 is 21231300213.

31200313212 is a `hidden beast` number, since 312 + 0 + 0 + 31 + 321 + 2 = 666.

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 (31200313219) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 320253 + ... + 406155.

It is an arithmetic number, because the mean of its divisors is an integer number (727606880).

Almost surely, 2^31200313212 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 31200313212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43656412800).

31200313212 is an abundant number, since it is smaller than the sum of its proper divisors (56112512388).

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

31200313212 is a wasteful number, since it uses less digits than its factorization.

31200313212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85997 (or 85986 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 31200313212 its reverse (21231300213), we get a palindrome (52431613425).

The spelling of 31200313212 in words is "thirty-one billion, two hundred million, three hundred thirteen thousand, two hundred twelve".