31013120300021 has 4 divisors (see below), whose sum is σ = 31013277572844. Its totient is φ = 31012963027200.

The previous prime is 31013120300011. The next prime is 31013120300039. The reversal of 31013120300021 is 12000302131013.

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 5507287191121 + 25505833108900 = 2346761^2 + 5050330^2 .

It is a cyclic number.

It is not a de Polignac number, because 31013120300021 - 2³⁴ = 30995940430837 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 (31013120300011) 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, 78340250 + ... + 78735131.

It is an arithmetic number, because the mean of its divisors is an integer number (7753319393211).

Almost surely, 2^{31013120300021} is an apocalyptic number.

It is an amenable number.

31013120300021 is a deficient number, since it is larger than the sum of its proper divisors (157272823).

31013120300021 is a wasteful number, since it uses less digits than its factorization.

31013120300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157272822.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 31013120300021 its reverse (12000302131013), we get a palindrome (43013422431034).

The spelling of 31013120300021 in words is "thirty-one trillion, thirteen billion, one hundred twenty million, three hundred thousand, twenty-one".