201020021211917 has 2 divisors, whose sum is σ = 201020021211918. Its totient is φ = 201020021211916.

The previous prime is 201020021211907. The next prime is 201020021212007. The reversal of 201020021211917 is 719112120020102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 188369970342436 + 12650050869481 = 13724794^2 + 3556691^2 .

It is a cyclic number.

It is not a de Polignac number, because 201020021211917 - 2²⁴ = 201020004434701 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 201020021211917.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (201020021211907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 100510010605958 + 100510010605959.

It is an arithmetic number, because the mean of its divisors is an integer number (100510010605959).

Almost surely, 2^{201020021211917} is an apocalyptic number.

It is an amenable number.

201020021211917 is a deficient number, since it is larger than the sum of its proper divisors (1).

201020021211917 is an equidigital number, since it uses as much as digits as its factorization.

201020021211917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1008, while the sum is 29.

The spelling of 201020021211917 in words is "two hundred one trillion, twenty billion, twenty-one million, two hundred eleven thousand, nine hundred seventeen".