21492596899849 has 2 divisors, whose sum is σ = 21492596899850. Its totient is φ = 21492596899848.

The previous prime is 21492596899847. The next prime is 21492596899867. The reversal of 21492596899849 is 94899869529412.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18927346210249 + 2565250689600 = 4350557^2 + 1601640^2 .

It is a cyclic number.

It is not a de Polignac number, because 21492596899849 - 2¹ = 21492596899847 is a prime.

Together with 21492596899847, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (21492596899847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10746298449924 + 10746298449925.

It is an arithmetic number, because the mean of its divisors is an integer number (10746298449925).

Almost surely, 2^{21492596899849} is an apocalyptic number.

It is an amenable number.

21492596899849 is a deficient number, since it is larger than the sum of its proper divisors (1).

21492596899849 is an equidigital number, since it uses as much as digits as its factorization.

21492596899849 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7255941120, while the sum is 85.

The spelling of 21492596899849 in words is "twenty-one trillion, four hundred ninety-two billion, five hundred ninety-six million, eight hundred ninety-nine thousand, eight hundred forty-nine".