21492596898989 has 2 divisors, whose sum is σ = 21492596898990. Its totient is φ = 21492596898988.

The previous prime is 21492596898967. The next prime is 21492596899001. The reversal of 21492596898989 is 98989869529412.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11374821984964 + 10117774914025 = 3372658^2 + 3180845^2 .

It is a cyclic number.

It is not a de Polignac number, because 21492596898989 - 2²⁰ = 21492595850413 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21492596858989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746298449494 + 10746298449495.

It is an arithmetic number, because the mean of its divisors is an integer number (10746298449495).

Almost surely, 2^{21492596898989} is an apocalyptic number.

It is an amenable number.

21492596898989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492596898989 is an equidigital number, since it uses as much as digits as its factorization.

21492596898989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14511882240, while the sum is 89.

The spelling of 21492596898989 in words is "twenty-one trillion, four hundred ninety-two billion, five hundred ninety-six million, eight hundred ninety-eight thousand, nine hundred eighty-nine".