311431321201220 has 96 divisors (see below), whose sum is σ = 744533323914240. Its totient is φ = 108316307327360.

The previous prime is 311431321201219. The next prime is 311431321201277. The reversal of 311431321201220 is 22102123134113.

It is a self number, because there is not a number n which added to its sum of digits gives 311431321201220.

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, 69908951 + ... + 74230209.

It is an arithmetic number, because the mean of its divisors is an integer number (7755555457440).

Almost surely, 2^{311431321201220} is an apocalyptic number.

It is an amenable number.

311431321201220 is an abundant number, since it is smaller than the sum of its proper divisors (433102002713020).

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

311431321201220 is a wasteful number, since it uses less digits than its factorization.

311431321201220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4335545 (or 4335543 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 26.

Adding to 311431321201220 its reverse (22102123134113), we get a palindrome (333533444335333).

The spelling of 311431321201220 in words is "three hundred eleven trillion, four hundred thirty-one billion, three hundred twenty-one million, two hundred one thousand, two hundred twenty".