31213031212 has 24 divisors (see below), whose sum is σ = 59968072080. Its totient is φ = 14097370560.

The previous prime is 31213031189. The next prime is 31213031231. The reversal of 31213031212 is 21213031213.

It is a self number, because there is not a number n which added to its sum of digits gives 31213031212.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2252287 + ... + 2266102.

It is an arithmetic number, because the mean of its divisors is an integer number (2498669670).

Almost surely, 2^31213031212 is an apocalyptic number.

It is an amenable number.

31213031212 is a deficient number, since it is larger than the sum of its proper divisors (28755040868).

31213031212 is a wasteful number, since it uses less digits than its factorization.

31213031212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4518561 (or 4518559 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 31213031212 its reverse (21213031213), we get a palindrome (52426062425).

Subtracting from 31213031212 its reverse (21213031213), we obtain a palindrome (9999999999).

The spelling of 31213031212 in words is "thirty-one billion, two hundred thirteen million, thirty-one thousand, two hundred twelve".