21080288797 has 2 divisors, whose sum is σ = 21080288798. Its totient is φ = 21080288796.

The previous prime is 21080288791. The next prime is 21080288807. The reversal of 21080288797 is 79788208012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11565066681 + 9515222116 = 107541^2 + 97546^2 .

It is a cyclic number.

It is not a de Polignac number, because 21080288797 - 2¹⁹ = 21079764509 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21080288791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10540144398 + 10540144399.

It is an arithmetic number, because the mean of its divisors is an integer number (10540144399).

Almost surely, 2^21080288797 is an apocalyptic number.

It is an amenable number.

21080288797 is a deficient number, since it is larger than the sum of its proper divisors (1).

21080288797 is an equidigital number, since it uses as much as digits as its factorization.

21080288797 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 52.

The spelling of 21080288797 in words is "twenty-one billion, eighty million, two hundred eighty-eight thousand, seven hundred ninety-seven".