311302221012 has 36 divisors (see below), whose sum is σ = 786984097536. Its totient is φ = 103756691280.

The previous prime is 311302220989. The next prime is 311302221049. The reversal of 311302221012 is 210122203113.

311302221012 is a `hidden beast` number, since 311 + 30 + 222 + 101 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 89118 + ... + 794069.

It is an arithmetic number, because the mean of its divisors is an integer number (21860669376).

Almost surely, 2^311302221012 is an apocalyptic number.

It is an amenable number.

311302221012 is an abundant number, since it is smaller than the sum of its proper divisors (475681876524).

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

311302221012 is a wasteful number, since it uses less digits than its factorization.

311302221012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 892988 (or 892983 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 311302221012 its reverse (210122203113), we get a palindrome (521424424125).

The spelling of 311302221012 in words is "three hundred eleven billion, three hundred two million, two hundred twenty-one thousand, twelve".