311311122220 has 192 divisors, whose sum is σ = 788715518976. Its totient is φ = 101005470720.

The previous prime is 311311122197. The next prime is 311311122289. The reversal of 311311122220 is 22221113113.

It is a super-2 number, since 2×311311122220² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24597414 + ... + 24610066.

It is an arithmetic number, because the mean of its divisors is an integer number (4107893328).

Almost surely, 2^311311122220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 311311122220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (394357759488).

311311122220 is an abundant number, since it is smaller than the sum of its proper divisors (477404396756).

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

311311122220 is a wasteful number, since it uses less digits than its factorization.

311311122220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12840 (or 12838 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 311311122220 its reverse (22221113113), we get a palindrome (333532235333).

The spelling of 311311122220 in words is "three hundred eleven billion, three hundred eleven million, one hundred twenty-two thousand, two hundred twenty".