21304797696 has 720 divisors, whose sum is σ = 80682585984. Its totient is φ = 5260197888.

The previous prime is 21304797677. The next prime is 21304797727. The reversal of 21304797696 is 69679740312.

It is a happy number.

21304797696 is a `hidden beast` number, since 2 + 13 + 0 + 479 + 76 + 96 = 666.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 453293545 + ... + 453293591.

Almost surely, 2^21304797696 is an apocalyptic number.

21304797696 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21304797696, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40341292992).

21304797696 is an abundant number, since it is smaller than the sum of its proper divisors (59377788288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21304797696 is a wasteful number, since it uses less digits than its factorization.

21304797696 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 95 counting only the distinct ones).

The product of its (nonzero) digits is 3429216, while the sum is 54.

The spelling of 21304797696 in words is "twenty-one billion, three hundred four million, seven hundred ninety-seven thousand, six hundred ninety-six".