31213211131212 has 72 divisors (see below), whose sum is σ = 80057967972528. Its totient is φ = 9458046660480.

The previous prime is 31213211131211. The next prime is 31213211131213. The reversal of 31213211131212 is 21213111231213.

It is an interprime number because it is at equal distance from previous prime (31213211131211) and next prime (31213211131213).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (31213211131211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 27254898 + ... + 28377030.

Almost surely, 2^{31213211131212} is an apocalyptic number.

It is an amenable number.

31213211131212 is an abundant number, since it is smaller than the sum of its proper divisors (48844756841316).

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

31213211131212 is a wasteful number, since it uses less digits than its factorization.

31213211131212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1141319 (or 1141306 counting only the distinct ones).

The product of its digits is 432, while the sum is 24.

Adding to 31213211131212 its reverse (21213111231213), we get a palindrome (52426322362425).

The spelling of 31213211131212 in words is "thirty-one trillion, two hundred thirteen billion, two hundred eleven million, one hundred thirty-one thousand, two hundred twelve".