21885338 has 4 divisors (see below), whose sum is σ = 32828010. Its totient is φ = 10942668.

The previous prime is 21885319. The next prime is 21885361. The reversal of 21885338 is 83358812.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 17032129 + 4853209 = 4127^2 + 2203^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5471333 + ... + 5471336.

Almost surely, 2^21885338 is an apocalyptic number.

21885338 is a deficient number, since it is larger than the sum of its proper divisors (10942672).

21885338 is a wasteful number, since it uses less digits than its factorization.

21885338 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10942671.

The product of its digits is 46080, while the sum is 38.

The square root of 21885338 is about 4678.1767816105. The cubic root of 21885338 is about 279.7162857486.

The spelling of 21885338 in words is "twenty-one million, eight hundred eighty-five thousand, three hundred thirty-eight".