311431120040021 has 4 divisors (see below), whose sum is σ = 329750597689452. Its totient is φ = 293111642390592.

The previous prime is 311431120039999. The next prime is 311431120040087. The reversal of 311431120040021 is 120040021134113.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 252698362527121 + 58732757512900 = 15896489^2 + 7663730^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431120040021 - 2¹⁴ = 311431120023637 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431120640021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9159738824690 + ... + 9159738824723.

It is an arithmetic number, because the mean of its divisors is an integer number (82437649422363).

Almost surely, 2^{311431120040021} is an apocalyptic number.

It is an amenable number.

311431120040021 is a deficient number, since it is larger than the sum of its proper divisors (18319477649431).

311431120040021 is a wasteful number, since it uses less digits than its factorization.

311431120040021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18319477649430.

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 311431120040021 its reverse (120040021134113), we get a palindrome (431471141174134).

The spelling of 311431120040021 in words is "three hundred eleven trillion, four hundred thirty-one billion, one hundred twenty million, forty thousand, twenty-one".