31212113212 has 48 divisors (see below), whose sum is σ = 64429989120. Its totient is φ = 12953584512.

The previous prime is 31212113167. The next prime is 31212113213. The reversal of 31212113212 is 21231121213.

It is a super-2 number, since 2×31212113212² (a number of 22 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 31212113212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31212113213) 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, 30313 + ... + 251680.

It is an arithmetic number, because the mean of its divisors is an integer number (1342291440).

Almost surely, 2^31212113212 is an apocalyptic number.

It is an amenable number.

31212113212 is an abundant number, since it is smaller than the sum of its proper divisors (33217875908).

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

31212113212 is a wasteful number, since it uses less digits than its factorization.

31212113212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282130 (or 282128 counting only the distinct ones).

The product of its digits is 144, while the sum is 19.

Adding to 31212113212 its reverse (21231121213), we get a palindrome (52443234425).

The spelling of 31212113212 in words is "thirty-one billion, two hundred twelve million, one hundred thirteen thousand, two hundred twelve".