31221412213 has 4 divisors (see below), whose sum is σ = 31543282540. Its totient is φ = 30899541888.

The previous prime is 31221412207. The next prime is 31221412297.

31221412213 is nontrivially palindromic in base 10.

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 5185008049 + 26036404164 = 72007^2 + 161358^2 .

It is a cyclic number.

It is not a de Polignac number, because 31221412213 - 2³³ = 22631477621 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 (31221412513) 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, 160935018 + ... + 160935211.

It is an arithmetic number, because the mean of its divisors is an integer number (7885820635).

Almost surely, 2^31221412213 is an apocalyptic number.

It is an amenable number.

31221412213 is a deficient number, since it is larger than the sum of its proper divisors (321870327).

31221412213 is an equidigital number, since it uses as much as digits as its factorization.

31221412213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 321870326.

The product of its digits is 576, while the sum is 22.

The spelling of 31221412213 in words is "thirty-one billion, two hundred twenty-one million, four hundred twelve thousand, two hundred thirteen".