311131100221 has 16 divisors (see below), whose sum is σ = 322076401920. Its totient is φ = 300393961920.

The previous prime is 311131100219. The next prime is 311131100227. The reversal of 311131100221 is 122001131113.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 311131100221 - 2¹ = 311131100219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311131100195 and 311131100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311131100227) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 874011 + ... + 1177351.

It is an arithmetic number, because the mean of its divisors is an integer number (20129775120).

Almost surely, 2^311131100221 is an apocalyptic number.

It is an amenable number.

311131100221 is a deficient number, since it is larger than the sum of its proper divisors (10945301699).

311131100221 is a wasteful number, since it uses less digits than its factorization.

311131100221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 303684.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 311131100221 its reverse (122001131113), we get a palindrome (433132231334).

The spelling of 311131100221 in words is "three hundred eleven billion, one hundred thirty-one million, one hundred thousand, two hundred twenty-one".