21024776897 has 2 divisors, whose sum is σ = 21024776898. Its totient is φ = 21024776896.

The previous prime is 21024776867. The next prime is 21024776963. The reversal of 21024776897 is 79867742012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11215657216 + 9809119681 = 105904^2 + 99041^2 .

It is a cyclic number.

It is not a de Polignac number, because 21024776897 - 2¹⁰ = 21024775873 is a prime.

It is not a weakly prime, because it can be changed into another prime (21024776867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10512388448 + 10512388449.

It is an arithmetic number, because the mean of its divisors is an integer number (10512388449).

Almost surely, 2^21024776897 is an apocalyptic number.

It is an amenable number.

21024776897 is a deficient number, since it is larger than the sum of its proper divisors (1).

21024776897 is an equidigital number, since it uses as much as digits as its factorization.

21024776897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2370816, while the sum is 53.

The spelling of 21024776897 in words is "twenty-one billion, twenty-four million, seven hundred seventy-six thousand, eight hundred ninety-seven".