21884854 has 4 divisors (see below), whose sum is σ = 32827284. Its totient is φ = 10942426.

The previous prime is 21884851. The next prime is 21884861. The reversal of 21884854 is 45848812.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884851) by changing a digit.

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 as a sum of consecutive naturals, namely, 5471212 + ... + 5471215.

It is an arithmetic number, because the mean of its divisors is an integer number (8206821).

Almost surely, 2^21884854 is an apocalyptic number.

21884854 is a deficient number, since it is larger than the sum of its proper divisors (10942430).

21884854 is a wasteful number, since it uses less digits than its factorization.

21884854 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10942429.

The product of its digits is 81920, while the sum is 40.

The square root of 21884854 is about 4678.1250517702. The cubic root of 21884854 is about 279.7142237337.

The spelling of 21884854 in words is "twenty-one million, eight hundred eighty-four thousand, eight hundred fifty-four".