311431003000021 has 4 divisors (see below), whose sum is σ = 322170003103500. Its totient is φ = 300692002896544.

The previous prime is 311431003000003. The next prime is 311431003000109. The reversal of 311431003000021 is 120000300134113.

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 136513846359396 + 174917156640625 = 11683914^2 + 13225625^2 .

It is a cyclic number.

It is not a de Polignac number, because 311431003000021 - 2³⁵ = 311396643261653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (311431003007021) 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, 5369500051696 + ... + 5369500051753.

It is an arithmetic number, because the mean of its divisors is an integer number (80542500775875).

Almost surely, 2^{311431003000021} is an apocalyptic number.

It is an amenable number.

311431003000021 is a deficient number, since it is larger than the sum of its proper divisors (10739000103479).

311431003000021 is a wasteful number, since it uses less digits than its factorization.

311431003000021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10739000103478.

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

Adding to 311431003000021 its reverse (120000300134113), we get a palindrome (431431303134134).

The spelling of 311431003000021 in words is "three hundred eleven trillion, four hundred thirty-one billion, three million, twenty-one", and thus it is an aban number.