21797244763 has 4 divisors (see below), whose sum is σ = 24911136880. Its totient is φ = 18683352648.

The previous prime is 21797244727. The next prime is 21797244769. The reversal of 21797244763 is 36744279712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21797244763 - 2¹⁷ = 21797113691 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21797244763.

It is not an unprimeable number, because it can be changed into a prime (21797244769) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1556946048 + ... + 1556946061.

It is an arithmetic number, because the mean of its divisors is an integer number (6227784220).

Almost surely, 2^21797244763 is an apocalyptic number.

21797244763 is a deficient number, since it is larger than the sum of its proper divisors (3113892117).

21797244763 is an equidigital number, since it uses as much as digits as its factorization.

21797244763 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3113892116.

The product of its digits is 3556224, while the sum is 52.

The spelling of 21797244763 in words is "twenty-one billion, seven hundred ninety-seven million, two hundred forty-four thousand, seven hundred sixty-three".