311202001220 has 48 divisors (see below), whose sum is σ = 713187695808. Its totient is φ = 113124332160.

The previous prime is 311202001199. The next prime is 311202001237. The reversal of 311202001220 is 22100202113.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 311202001195 and 311202001204.

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, 376682 + ... + 874238.

It is an arithmetic number, because the mean of its divisors is an integer number (14858076996).

Almost surely, 2^311202001220 is an apocalyptic number.

It is an amenable number.

311202001220 is an abundant number, since it is smaller than the sum of its proper divisors (401985694588).

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

311202001220 is a wasteful number, since it uses less digits than its factorization.

311202001220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 500420 (or 500418 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 311202001220 its reverse (22100202113), we get a palindrome (333302203333).

The spelling of 311202001220 in words is "three hundred eleven billion, two hundred two million, one thousand, two hundred twenty".