21884794 has 8 divisors (see below), whose sum is σ = 32849460. Its totient is φ = 10934976.

The previous prime is 21884783. The next prime is 21884809. The reversal of 21884794 is 49748812.

It can be written as a sum of positive squares in 2 ways, for example, as 14250625 + 7634169 = 3775^2 + 2763^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 21884794.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1362 + ... + 6754.

Almost surely, 2^21884794 is an apocalyptic number.

21884794 is a deficient number, since it is larger than the sum of its proper divisors (10964666).

21884794 is a wasteful number, since it uses less digits than its factorization.

21884794 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7424.

The product of its digits is 129024, while the sum is 43.

The square root of 21884794 is about 4678.1186389402. The cubic root of 21884794 is about 279.7139681099.

The spelling of 21884794 in words is "twenty-one million, eight hundred eighty-four thousand, seven hundred ninety-four".