31221010011113 has 4 divisors (see below), whose sum is σ = 33622626165828. Its totient is φ = 28819393856400.

The previous prime is 31221010011073. The next prime is 31221010011227. The reversal of 31221010011113 is 31111001012213.

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 10456246566544 + 20764763444569 = 3233612^2 + 4556837^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221010011113 - 2¹⁶ = 31221009945577 is a prime.

It is a super-2 number, since 2×31221010011113² (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 = 31221010011091 and 31221010011100.

It is not an unprimeable number, because it can be changed into a prime (31221010011413) 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, 1200808077338 + ... + 1200808077363.

It is an arithmetic number, because the mean of its divisors is an integer number (8405656541457).

Almost surely, 2^{31221010011113} is an apocalyptic number.

It is an amenable number.

31221010011113 is a deficient number, since it is larger than the sum of its proper divisors (2401616154715).

31221010011113 is a wasteful number, since it uses less digits than its factorization.

31221010011113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2401616154714.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 31221010011113 its reverse (31111001012213), we get a palindrome (62332011023326).

The spelling of 31221010011113 in words is "thirty-one trillion, two hundred twenty-one billion, ten million, eleven thousand, one hundred thirteen".