311211320012 has 36 divisors (see below), whose sum is σ = 597226757400. Its totient is φ = 141402277632.

The previous prime is 311211319967. The next prime is 311211320039. The reversal of 311211320012 is 210023112113.

It is a super-2 number, since 2×311211320012² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 2663762 + ... + 2778137.

It is an arithmetic number, because the mean of its divisors is an integer number (16589632150).

Almost surely, 2^311211320012 is an apocalyptic number.

It is an amenable number.

311211320012 is a deficient number, since it is larger than the sum of its proper divisors (286015437388).

311211320012 is a wasteful number, since it uses less digits than its factorization.

311211320012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5441978 (or 5441947 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 311211320012 its reverse (210023112113), we get a palindrome (521234432125).

The spelling of 311211320012 in words is "three hundred eleven billion, two hundred eleven million, three hundred twenty thousand, twelve".