21866674 has 8 divisors (see below), whose sum is σ = 32853888. Its totient is φ = 10915380.

The previous prime is 21866671. The next prime is 21866693. The reversal of 21866674 is 47666812.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21866671) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7402 + ... + 9925.

It is an arithmetic number, because the mean of its divisors is an integer number (4106736).

Almost surely, 2^21866674 is an apocalyptic number.

21866674 is a deficient number, since it is larger than the sum of its proper divisors (10987214).

21866674 is a wasteful number, since it uses less digits than its factorization.

21866674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17960.

The product of its digits is 96768, while the sum is 40.

The square root of 21866674 is about 4676.1815619157. The cubic root of 21866674 is about 279.6367483352.

The spelling of 21866674 in words is "twenty-one million, eight hundred sixty-six thousand, six hundred seventy-four".