312221121122213 has 4 divisors (see below), whose sum is σ = 312224412154668. Its totient is φ = 312217830089760.

The previous prime is 312221121122159. The next prime is 312221121122221.

312221121122213 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 259646106877444 + 52575014244769 = 16113538^2 + 7250863^2 .

It is a cyclic number.

It is not a de Polignac number, because 312221121122213 - 2¹² = 312221121118117 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 (312221121122263) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1645373918 + ... + 1645563663.

It is an arithmetic number, because the mean of its divisors is an integer number (78056103038667).

Almost surely, 2^{312221121122213} is an apocalyptic number.

It is an amenable number.

312221121122213 is a deficient number, since it is larger than the sum of its proper divisors (3291032455).

312221121122213 is an equidigital number, since it uses as much as digits as its factorization.

312221121122213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3291032454.

The product of its digits is 1152, while the sum is 26.

The spelling of 312221121122213 in words is "three hundred twelve trillion, two hundred twenty-one billion, one hundred twenty-one million, one hundred twenty-two thousand, two hundred thirteen".