21992821352017 has 2 divisors, whose sum is σ = 21992821352018. Its totient is φ = 21992821352016.

The previous prime is 21992821352003. The next prime is 21992821352057. The reversal of 21992821352017 is 71025312829912.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12776399699281 + 9216421652736 = 3574409^2 + 3035856^2 .

It is a cyclic number.

It is not a de Polignac number, because 21992821352017 - 2¹⁹ = 21992820827729 is a prime.

It is not a weakly prime, because it can be changed into another prime (21992821352057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10996410676008 + 10996410676009.

It is an arithmetic number, because the mean of its divisors is an integer number (10996410676009).

Almost surely, 2^{21992821352017} is an apocalyptic number.

It is an amenable number.

21992821352017 is a deficient number, since it is larger than the sum of its proper divisors (1).

21992821352017 is an equidigital number, since it uses as much as digits as its factorization.

21992821352017 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1088640, while the sum is 52.

The spelling of 21992821352017 in words is "twenty-one trillion, nine hundred ninety-two billion, eight hundred twenty-one million, three hundred fifty-two thousand, seventeen".