2115543211217 has 2 divisors, whose sum is σ = 2115543211218. Its totient is φ = 2115543211216.

The previous prime is 2115543211213. The next prime is 2115543211339. The reversal of 2115543211217 is 7121123455112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1877121946561 + 238421264656 = 1370081^2 + 488284^2 .

It is a cyclic number.

It is not a de Polignac number, because 2115543211217 - 2² = 2115543211213 is a prime.

It is not a weakly prime, because it can be changed into another prime (2115543211213) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1057771605608 + 1057771605609.

It is an arithmetic number, because the mean of its divisors is an integer number (1057771605609).

Almost surely, 2^{2115543211217} is an apocalyptic number.

It is an amenable number.

2115543211217 is a deficient number, since it is larger than the sum of its proper divisors (1).

2115543211217 is an equidigital number, since it uses as much as digits as its factorization.

2115543211217 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16800, while the sum is 35.

Adding to 2115543211217 its reverse (7121123455112), we get a palindrome (9236666666329).

The spelling of 2115543211217 in words is "two trillion, one hundred fifteen billion, five hundred forty-three million, two hundred eleven thousand, two hundred seventeen".