311204040021 has 24 divisors (see below), whose sum is σ = 513760837824. Its totient is φ = 177821470080.

The previous prime is 311204040011. The next prime is 311204040079. The reversal of 311204040021 is 120040402113.

It is not a de Polignac number, because 311204040021 - 2²³ = 311195651413 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 311204039976 and 311204040003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311204040011) 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, 1171501 + ... + 1412381.

It is an arithmetic number, because the mean of its divisors is an integer number (21406701576).

Almost surely, 2^311204040021 is an apocalyptic number.

It is an amenable number.

311204040021 is a deficient number, since it is larger than the sum of its proper divisors (202556797803).

311204040021 is a wasteful number, since it uses less digits than its factorization.

311204040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 261401 (or 261398 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 311204040021 its reverse (120040402113), we get a palindrome (431244442134).

The spelling of 311204040021 in words is "three hundred eleven billion, two hundred four million, forty thousand, twenty-one".