311430000031021 has 4 divisors (see below), whose sum is σ = 311430206724700. Its totient is φ = 311429793337344.

The previous prime is 311430000030979. The next prime is 311430000031093. The reversal of 311430000031021 is 120130000034113.

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 175914092354121 + 135515907676900 = 13263261^2 + 11641130^2 .

It is a cyclic number.

It is not a de Polignac number, because 311430000031021 - 2⁹ = 311430000030509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 311430000031021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311430000041021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 101070036 + ... + 104105773.

It is an arithmetic number, because the mean of its divisors is an integer number (77857551681175).

Almost surely, 2^{311430000031021} is an apocalyptic number.

It is an amenable number.

311430000031021 is a deficient number, since it is larger than the sum of its proper divisors (206693679).

311430000031021 is a wasteful number, since it uses less digits than its factorization.

311430000031021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206693678.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 311430000031021 its reverse (120130000034113), we get a palindrome (431560000065134).

The spelling of 311430000031021 in words is "three hundred eleven trillion, four hundred thirty billion, thirty-one thousand, twenty-one".