31320313300021 has 4 divisors (see below), whose sum is σ = 32400324103500. Its totient is φ = 30240302496544.

The previous prime is 31320313299971. The next prime is 31320313300043. The reversal of 31320313300021 is 12000331302313.

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 18273487562500 + 13046825737521 = 4274750^2 + 3612039^2 .

It is a cyclic number.

It is not a de Polignac number, because 31320313300021 - 2⁷ = 31320313299893 is a prime.

It is a super-2 number, since 2×31320313300021² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31320313299965 and 31320313300001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31320313300051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 540005401696 + ... + 540005401753.

It is an arithmetic number, because the mean of its divisors is an integer number (8100081025875).

Almost surely, 2^{31320313300021} is an apocalyptic number.

It is an amenable number.

31320313300021 is a deficient number, since it is larger than the sum of its proper divisors (1080010803479).

31320313300021 is a wasteful number, since it uses less digits than its factorization.

31320313300021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1080010803478.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 31320313300021 its reverse (12000331302313), we get a palindrome (43320644602334).

The spelling of 31320313300021 in words is "thirty-one trillion, three hundred twenty billion, three hundred thirteen million, three hundred thousand, twenty-one".