31330112122021 has 4 divisors (see below), whose sum is σ = 31640311252044. Its totient is φ = 31019912992000.

The previous prime is 31330112121991. The next prime is 31330112122031. The reversal of 31330112122021 is 12022121103313.

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 27248556600225 + 4081555521796 = 5220015^2 + 2020286^2 .

It is a cyclic number.

It is not a de Polignac number, because 31330112122021 - 2⁵ = 31330112121989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 31330112121983 and 31330112122001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31330112122031) 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, 155099564860 + ... + 155099565061.

It is an arithmetic number, because the mean of its divisors is an integer number (7910077813011).

Almost surely, 2^{31330112122021} is an apocalyptic number.

It is an amenable number.

31330112122021 is a deficient number, since it is larger than the sum of its proper divisors (310199130023).

31330112122021 is a wasteful number, since it uses less digits than its factorization.

31330112122021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 310199130022.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 31330112122021 its reverse (12022121103313), we get a palindrome (43352233225334).

The spelling of 31330112122021 in words is "thirty-one trillion, three hundred thirty billion, one hundred twelve million, one hundred twenty-two thousand, twenty-one".