213121213322917 has 2 divisors, whose sum is σ = 213121213322918. Its totient is φ = 213121213322916.

The previous prime is 213121213322911. The next prime is 213121213322957. The reversal of 213121213322917 is 719223312121312.

213121213322917 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (213121213322957) can be obtained adding 213121213322917 to its sum of digits (40).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 110097718620516 + 103023494702401 = 10492746^2 + 10150049^2 .

It is a cyclic number.

It is not a de Polignac number, because 213121213322917 - 2¹⁵ = 213121213290149 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 213121213322917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213121213322911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106560606661458 + 106560606661459.

It is an arithmetic number, because the mean of its divisors is an integer number (106560606661459).

Almost surely, 2^{213121213322917} is an apocalyptic number.

It is an amenable number.

213121213322917 is a deficient number, since it is larger than the sum of its proper divisors (1).

213121213322917 is an equidigital number, since it uses as much as digits as its factorization.

213121213322917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54432, while the sum is 40.

The spelling of 213121213322917 in words is "two hundred thirteen trillion, one hundred twenty-one billion, two hundred thirteen million, three hundred twenty-two thousand, nine hundred seventeen".