31331330300021 has 4 divisors (see below), whose sum is σ = 33174349729452. Its totient is φ = 29488310870592.

The previous prime is 31331330299991. The next prime is 31331330300057. The reversal of 31331330300021 is 12000303313313.

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 19191750343921 + 12139579956100 = 4380839^2 + 3484190^2 .

It is a cyclic number.

It is not a de Polignac number, because 31331330300021 - 2¹⁰ = 31331330298997 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 31331330300021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31331330309021) 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, 921509714690 + ... + 921509714723.

It is an arithmetic number, because the mean of its divisors is an integer number (8293587432363).

Almost surely, 2^{31331330300021} is an apocalyptic number.

It is an amenable number.

31331330300021 is a deficient number, since it is larger than the sum of its proper divisors (1843019429431).

31331330300021 is a wasteful number, since it uses less digits than its factorization.

31331330300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1843019429430.

The product of its (nonzero) digits is 1458, while the sum is 23.

Adding to 31331330300021 its reverse (12000303313313), we get a palindrome (43331633613334).

The spelling of 31331330300021 in words is "thirty-one trillion, three hundred thirty-one billion, three hundred thirty million, three hundred thousand, twenty-one".