311311212220 has 24 divisors (see below), whose sum is σ = 653922942624. Its totient is φ = 124492218816.

The previous prime is 311311212187. The next prime is 311311212229. The reversal of 311311212220 is 22212113113.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311311212229) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1937439 + ... + 2091958.

It is an arithmetic number, because the mean of its divisors is an integer number (27246789276).

Almost surely, 2^311311212220 is an apocalyptic number.

It is an amenable number.

311311212220 is an abundant number, since it is smaller than the sum of its proper divisors (342611730404).

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

311311212220 is a wasteful number, since it uses less digits than its factorization.

311311212220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4033269 (or 4033267 counting only the distinct ones).

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

Adding to 311311212220 its reverse (22212113113), we get a palindrome (333523325333).

The spelling of 311311212220 in words is "three hundred eleven billion, three hundred eleven million, two hundred twelve thousand, two hundred twenty".