21823697 has 8 divisors (see below), whose sum is σ = 25042752. Its totient is φ = 18630000.

The previous prime is 21823693. The next prime is 21823717. The reversal of 21823697 is 79632812.

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 21823697 - 2² = 21823693 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21823697.

It is not an unprimeable number, because it can be changed into a prime (21823691) 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, 4454 + ... + 7967.

It is an arithmetic number, because the mean of its divisors is an integer number (3130344).

Almost surely, 2^21823697 is an apocalyptic number.

It is an amenable number.

21823697 is a deficient number, since it is larger than the sum of its proper divisors (3219055).

21823697 is a wasteful number, since it uses less digits than its factorization.

21823697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12679.

The product of its digits is 36288, while the sum is 38.

The square root of 21823697 is about 4671.5839926089. The cubic root of 21823697 is about 279.4534278091.

The spelling of 21823697 in words is "twenty-one million, eight hundred twenty-three thousand, six hundred ninety-seven".