20993021342017 has 2 divisors, whose sum is σ = 20993021342018. Its totient is φ = 20993021342016.

The previous prime is 20993021341979. The next prime is 20993021342023. The reversal of 20993021342017 is 71024312039902.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11611199365441 + 9381821976576 = 3407521^2 + 3062976^2 .

It is a cyclic number.

It is not a de Polignac number, because 20993021342017 - 2³⁹ = 20443265528129 is a prime.

It is not a weakly prime, because it can be changed into another prime (20993021342047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10496510671008 + 10496510671009.

It is an arithmetic number, because the mean of its divisors is an integer number (10496510671009).

Almost surely, 2^{20993021342017} is an apocalyptic number.

It is an amenable number.

20993021342017 is a deficient number, since it is larger than the sum of its proper divisors (1).

20993021342017 is an equidigital number, since it uses as much as digits as its factorization.

20993021342017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 20993021342017 in words is "twenty trillion, nine hundred ninety-three billion, twenty-one million, three hundred forty-two thousand, seventeen".