21974317 has 8 divisors (see below), whose sum is σ = 23192960. Its totient is φ = 20761920.

The previous prime is 21974299. The next prime is 21974321. The reversal of 21974317 is 71347912.

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 21974317 - 2¹⁹ = 21450029 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 (21974357) 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, 6892 + ... + 9562.

It is an arithmetic number, because the mean of its divisors is an integer number (2899120).

Almost surely, 2^21974317 is an apocalyptic number.

It is an amenable number.

21974317 is a deficient number, since it is larger than the sum of its proper divisors (1218643).

21974317 is a wasteful number, since it uses less digits than its factorization.

21974317 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3123.

The product of its digits is 10584, while the sum is 34.

The square root of 21974317 is about 4687.6771433195. The cubic root of 21974317 is about 280.0948530679.

The spelling of 21974317 in words is "twenty-one million, nine hundred seventy-four thousand, three hundred seventeen".