212071492817 has 2 divisors, whose sum is σ = 212071492818. Its totient is φ = 212071492816.

The previous prime is 212071492799. The next prime is 212071492889. The reversal of 212071492817 is 718294170212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 199129245121 + 12942247696 = 446239^2 + 113764^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212071492817 is a prime.

It is not a weakly prime, because it can be changed into another prime (212071495817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106035746408 + 106035746409.

It is an arithmetic number, because the mean of its divisors is an integer number (106035746409).

Almost surely, 2^212071492817 is an apocalyptic number.

It is an amenable number.

212071492817 is a deficient number, since it is larger than the sum of its proper divisors (1).

212071492817 is an equidigital number, since it uses as much as digits as its factorization.

212071492817 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 44.

The spelling of 212071492817 in words is "two hundred twelve billion, seventy-one million, four hundred ninety-two thousand, eight hundred seventeen".