21674685 has 8 divisors (see below), whose sum is σ = 34679520. Its totient is φ = 11559824.

The previous prime is 21674683. The next prime is 21674693. The reversal of 21674685 is 58647612.

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 21674685 - 2¹ = 21674683 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21674683) 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, 722475 + ... + 722504.

It is an arithmetic number, because the mean of its divisors is an integer number (4334940).

Almost surely, 2^21674685 is an apocalyptic number.

It is an amenable number.

21674685 is a deficient number, since it is larger than the sum of its proper divisors (13004835).

21674685 is a wasteful number, since it uses less digits than its factorization.

21674685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1444987.

The product of its digits is 80640, while the sum is 39.

The square root of 21674685 is about 4655.6079087483. The cubic root of 21674685 is about 278.8159395440.

The spelling of 21674685 in words is "twenty-one million, six hundred seventy-four thousand, six hundred eighty-five".