313121331212 has 48 divisors (see below), whose sum is σ = 581399350560. Its totient is φ = 147045811200.

The previous prime is 313121331209. The next prime is 313121331239. The reversal of 313121331212 is 212133121313.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 112268714 + ... + 112271502.

It is an arithmetic number, because the mean of its divisors is an integer number (12112486470).

Almost surely, 2^313121331212 is an apocalyptic number.

It is an amenable number.

313121331212 is a deficient number, since it is larger than the sum of its proper divisors (268278019348).

313121331212 is a wasteful number, since it uses less digits than its factorization.

313121331212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5642 (or 5640 counting only the distinct ones).

The product of its digits is 648, while the sum is 23.

Adding to 313121331212 its reverse (212133121313), we get a palindrome (525254452525).

The spelling of 313121331212 in words is "three hundred thirteen billion, one hundred twenty-one million, three hundred thirty-one thousand, two hundred twelve".