311020213224 has 128 divisors (see below), whose sum is σ = 917729280000. Its totient is φ = 85955627520.

The previous prime is 311020213211. The next prime is 311020213261. The reversal of 311020213224 is 422312020113.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 311020213224.

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, 11949777 + ... + 11975775.

It is an arithmetic number, because the mean of its divisors is an integer number (7169760000).

Almost surely, 2^311020213224 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 311020213224, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (458864640000).

311020213224 is an abundant number, since it is smaller than the sum of its proper divisors (606709066776).

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

311020213224 is a wasteful number, since it uses less digits than its factorization.

311020213224 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28343 (or 28339 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 311020213224 its reverse (422312020113), we get a palindrome (733332233337).

The spelling of 311020213224 in words is "three hundred eleven billion, twenty million, two hundred thirteen thousand, two hundred twenty-four".