21696697 has 8 divisors (see below), whose sum is σ = 23728320. Its totient is φ = 19674960.

The previous prime is 21696629. The next prime is 21696707. The reversal of 21696697 is 79669612.

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 21696697 - 2²³ = 13308089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21696617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2583 + ... + 7075.

It is an arithmetic number, because the mean of its divisors is an integer number (2966040).

Almost surely, 2^21696697 is an apocalyptic number.

It is an amenable number.

21696697 is a deficient number, since it is larger than the sum of its proper divisors (2031623).

21696697 is a wasteful number, since it uses less digits than its factorization.

21696697 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4943.

The product of its digits is 244944, while the sum is 46.

The square root of 21696697 is about 4657.9713395426. The cubic root of 21696697 is about 278.9102926266.

The spelling of 21696697 in words is "twenty-one million, six hundred ninety-six thousand, six hundred ninety-seven".