21606016767 has 8 divisors (see below), whose sum is σ = 28909818624. Its totient is φ = 14353113048.

The previous prime is 21606016753. The next prime is 21606016799. The reversal of 21606016767 is 76761060612.

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

It is not a de Polignac number, because 21606016767 - 2⁸ = 21606016511 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21606016727) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12723543 + ... + 12725240.

It is an arithmetic number, because the mean of its divisors is an integer number (3613727328).

Almost surely, 2^21606016767 is an apocalyptic number.

21606016767 is a deficient number, since it is larger than the sum of its proper divisors (7303801857).

21606016767 is a wasteful number, since it uses less digits than its factorization.

21606016767 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25449069.

The product of its (nonzero) digits is 127008, while the sum is 42.

The spelling of 21606016767 in words is "twenty-one billion, six hundred six million, sixteen thousand, seven hundred sixty-seven".