21707693 has 8 divisors (see below), whose sum is σ = 25229760. Its totient is φ = 18290880.

The previous prime is 21707603. The next prime is 21707701. The reversal of 21707693 is 39670712.

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 21707693 - 2⁸ = 21707437 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21707603) 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, 25868 + ... + 26693.

It is an arithmetic number, because the mean of its divisors is an integer number (3153720).

Almost surely, 2^21707693 is an apocalyptic number.

It is an amenable number.

21707693 is a deficient number, since it is larger than the sum of its proper divisors (3522067).

21707693 is an equidigital number, since it uses as much as digits as its factorization.

21707693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52627.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 21707693 is about 4659.1515321998. The cubic root of 21707693 is about 278.9574024027.

The spelling of 21707693 in words is "twenty-one million, seven hundred seven thousand, six hundred ninety-three".