313231133221220 has 48 divisors (see below), whose sum is σ = 660003281442288. Its totient is φ = 124870377308160.

The previous prime is 313231133221217. The next prime is 313231133221243. The reversal of 313231133221220 is 22122331132313.

It can be written as a sum of positive squares in 8 ways, for example, as 173237559576676 + 139993573644544 = 13161974^2 + 11831888^2 .

It is a super-2 number, since 2×313231133221220² (a number of 30 digits) contains 22 as substring.

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, 1218452 + ... + 25058868.

It is an arithmetic number, because the mean of its divisors is an integer number (13750068363381).

Almost surely, 2^{313231133221220} is an apocalyptic number.

It is an amenable number.

313231133221220 is an abundant number, since it is smaller than the sum of its proper divisors (346772148221068).

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

313231133221220 is a wasteful number, since it uses less digits than its factorization.

313231133221220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23842640 (or 23842638 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 29.

Adding to 313231133221220 its reverse (22122331132313), we get a palindrome (335353464353533).

The spelling of 313231133221220 in words is "three hundred thirteen trillion, two hundred thirty-one billion, one hundred thirty-three million, two hundred twenty-one thousand, two hundred twenty".