21769760497 has 2 divisors, whose sum is σ = 21769760498. Its totient is φ = 21769760496.

The previous prime is 21769760491. The next prime is 21769760527. The reversal of 21769760497 is 79406796712.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20823644416 + 946116081 = 144304^2 + 30759^2 .

It is a cyclic number.

It is not a de Polignac number, because 21769760497 - 2¹¹ = 21769758449 is a prime.

It is not a weakly prime, because it can be changed into another prime (21769760491) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10884880248 + 10884880249.

It is an arithmetic number, because the mean of its divisors is an integer number (10884880249).

Almost surely, 2^21769760497 is an apocalyptic number.

It is an amenable number.

21769760497 is a deficient number, since it is larger than the sum of its proper divisors (1).

21769760497 is an equidigital number, since it uses as much as digits as its factorization.

21769760497 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8001504, while the sum is 58.

The spelling of 21769760497 in words is "twenty-one billion, seven hundred sixty-nine million, seven hundred sixty thousand, four hundred ninety-seven".