21206716079 has 8 divisors (see below), whose sum is σ = 22472344368. Its totient is φ = 19943107200.

The previous prime is 21206716073. The next prime is 21206716087. The reversal of 21206716079 is 97061760212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21206716079 - 2⁸ = 21206715823 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 (21206716073) 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 7 ways as a sum of consecutive naturals, for example, 483197 + ... + 525254.

It is an arithmetic number, because the mean of its divisors is an integer number (2809043046).

Almost surely, 2^21206716079 is an apocalyptic number.

21206716079 is a deficient number, since it is larger than the sum of its proper divisors (1265628289).

21206716079 is a wasteful number, since it uses less digits than its factorization.

21206716079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009705.

The product of its (nonzero) digits is 63504, while the sum is 41.

The spelling of 21206716079 in words is "twenty-one billion, two hundred six million, seven hundred sixteen thousand, seventy-nine".