311031310221 has 24 divisors (see below), whose sum is σ = 472986974720. Its totient is φ = 196410142656.

The previous prime is 311031310217. The next prime is 311031310253. The reversal of 311031310221 is 122013130113.

311031310221 is a `hidden beast` number, since 31 + 103 + 1 + 310 + 221 = 666.

It is not a de Polignac number, because 311031310221 - 2² = 311031310217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 311031310194 and 311031310203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311031311221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 981780 + ... + 1259346.

Almost surely, 2^311031310221 is an apocalyptic number.

It is an amenable number.

311031310221 is a deficient number, since it is larger than the sum of its proper divisors (161955664499).

311031310221 is a wasteful number, since it uses less digits than its factorization.

311031310221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284145 (or 284142 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 18.

Adding to 311031310221 its reverse (122013130113), we get a palindrome (433044440334).

The spelling of 311031310221 in words is "three hundred eleven billion, thirty-one million, three hundred ten thousand, two hundred twenty-one".