21297763798 has 16 divisors (see below), whose sum is σ = 31999674096. Its totient is φ = 10631221920.

The previous prime is 21297763783. The next prime is 21297763801. The reversal of 21297763798 is 89736779212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4314940 + ... + 4319872.

It is an arithmetic number, because the mean of its divisors is an integer number (1999979631).

Almost surely, 2^21297763798 is an apocalyptic number.

21297763798 is a deficient number, since it is larger than the sum of its proper divisors (10701910298).

21297763798 is a wasteful number, since it uses less digits than its factorization.

21297763798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8079.

The product of its digits is 16003008, while the sum is 61.

The spelling of 21297763798 in words is "twenty-one billion, two hundred ninety-seven million, seven hundred sixty-three thousand, seven hundred ninety-eight".