21297799545959 has 2 divisors, whose sum is σ = 21297799545960. Its totient is φ = 21297799545958.

The previous prime is 21297799545941. The next prime is 21297799545991. The reversal of 21297799545959 is 95954599779212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21297799545959 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21297799545559) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10648899772979 + 10648899772980.

It is an arithmetic number, because the mean of its divisors is an integer number (10648899772980).

Almost surely, 2^{21297799545959} is an apocalyptic number.

21297799545959 is a deficient number, since it is larger than the sum of its proper divisors (1).

21297799545959 is an equidigital number, since it uses as much as digits as its factorization.

21297799545959 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5786802000, while the sum is 83.

The spelling of 21297799545959 in words is "twenty-one trillion, two hundred ninety-seven billion, seven hundred ninety-nine million, five hundred forty-five thousand, nine hundred fifty-nine".