313212131220 has 96 divisors (see below), whose sum is σ = 890839127808. Its totient is φ = 82209364992.

The previous prime is 313212131189. The next prime is 313212131291. The reversal of 313212131220 is 22131212313.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2059642 + ... + 2206478.

It is an arithmetic number, because the mean of its divisors is an integer number (9279574248).

Almost surely, 2^313212131220 is an apocalyptic number.

313212131220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 313212131220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (445419563904).

313212131220 is an abundant number, since it is smaller than the sum of its proper divisors (577626996588).

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

313212131220 is a wasteful number, since it uses less digits than its factorization.

313212131220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147409 (or 147407 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 313212131220 its reverse (22131212313), we get a palindrome (335343343533).

The spelling of 313212131220 in words is "three hundred thirteen billion, two hundred twelve million, one hundred thirty-one thousand, two hundred twenty".