21674917 has 8 divisors (see below), whose sum is σ = 23693760. Its totient is φ = 19664160.

The previous prime is 21674911. The next prime is 21674923. The reversal of 21674917 is 71947612.

It is an interprime number because it is at equal distance from previous prime (21674911) and next prime (21674923).

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 21674917 - 2⁷ = 21674789 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 (21674911) 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, 4528 + ... + 7990.

It is an arithmetic number, because the mean of its divisors is an integer number (2961720).

Almost surely, 2^21674917 is an apocalyptic number.

It is an amenable number.

21674917 is a deficient number, since it is larger than the sum of its proper divisors (2018843).

21674917 is a wasteful number, since it uses less digits than its factorization.

21674917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4043.

The product of its digits is 21168, while the sum is 37.

The square root of 21674917 is about 4655.6328248692. The cubic root of 21674917 is about 278.8169343308.

The spelling of 21674917 in words is "twenty-one million, six hundred seventy-four thousand, nine hundred seventeen".