2021229568517 has 2 divisors, whose sum is σ = 2021229568518. Its totient is φ = 2021229568516.

The previous prime is 2021229568459. The next prime is 2021229568559. The reversal of 2021229568517 is 7158659221202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1214769891556 + 806459676961 = 1102166^2 + 898031^2 .

It is a cyclic number.

It is not a de Polignac number, because 2021229568517 - 2¹⁰ = 2021229567493 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2021229568577) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1010614784258 + 1010614784259.

It is an arithmetic number, because the mean of its divisors is an integer number (1010614784259).

Almost surely, 2^{2021229568517} is an apocalyptic number.

It is an amenable number.

2021229568517 is a deficient number, since it is larger than the sum of its proper divisors (1).

2021229568517 is an equidigital number, since it uses as much as digits as its factorization.

2021229568517 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1209600, while the sum is 50.

The spelling of 2021229568517 in words is "two trillion, twenty-one billion, two hundred twenty-nine million, five hundred sixty-eight thousand, five hundred seventeen".