21894674 has 8 divisors (see below), whose sum is σ = 34773948. Its totient is φ = 10303360.

The previous prime is 21894667. The next prime is 21894683. The reversal of 21894674 is 47649812.

It can be written as a sum of positive squares in 2 ways, for example, as 21687649 + 207025 = 4657^2 + 455^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 321947 + ... + 322014.

Almost surely, 2^21894674 is an apocalyptic number.

21894674 is a deficient number, since it is larger than the sum of its proper divisors (12879274).

21894674 is a wasteful number, since it uses less digits than its factorization.

21894674 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 643980.

The product of its digits is 96768, while the sum is 41.

The square root of 21894674 is about 4679.1744998450. The cubic root of 21894674 is about 279.7560545350.

The spelling of 21894674 in words is "twenty-one million, eight hundred ninety-four thousand, six hundred seventy-four".