21766882 has 4 divisors (see below), whose sum is σ = 32650326. Its totient is φ = 10883440.

The previous prime is 21766873. The next prime is 21766889. The reversal of 21766882 is 28866712.

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., 16573041 + 5193841 = 4071^2 + 2279^2 .

It is not an unprimeable number, because it can be changed into a prime (21766889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5441719 + ... + 5441722.

Almost surely, 2^21766882 is an apocalyptic number.

21766882 is a deficient number, since it is larger than the sum of its proper divisors (10883444).

21766882 is a wasteful number, since it uses less digits than its factorization.

21766882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10883443.

The product of its digits is 64512, while the sum is 40.

The square root of 21766882 is about 4665.4991158503. The cubic root of 21766882 is about 279.2107108449.

The spelling of 21766882 in words is "twenty-one million, seven hundred sixty-six thousand, eight hundred eighty-two".