21684796007 has 12 divisors (see below), whose sum is σ = 26155625616. Its totient is φ = 17608704480.

The previous prime is 21684795997. The next prime is 21684796039. The reversal of 21684796007 is 70069748612.

It is not a de Polignac number, because 21684796007 - 2⁶ = 21684795943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21684796307) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4288094 + ... + 4293147.

It is an arithmetic number, because the mean of its divisors is an integer number (2179635468).

Almost surely, 2^21684796007 is an apocalyptic number.

21684796007 is a deficient number, since it is larger than the sum of its proper divisors (4470829609).

21684796007 is an equidigital number, since it uses as much as digits as its factorization.

21684796007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8581286 (or 8581267 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The spelling of 21684796007 in words is "twenty-one billion, six hundred eighty-four million, seven hundred ninety-six thousand, seven".