21884379 has 8 divisors (see below), whose sum is σ = 31831872. Its totient is φ = 13263240.

The previous prime is 21884351. The next prime is 21884383. The reversal of 21884379 is 97348812.

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

It is not a de Polignac number, because 21884379 - 2⁵ = 21884347 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21884379.

It is not an unprimeable number, because it can be changed into a prime (21884329) 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 in 7 ways as a sum of consecutive naturals, for example, 331549 + ... + 331614.

It is an arithmetic number, because the mean of its divisors is an integer number (3978984).

Almost surely, 2^21884379 is an apocalyptic number.

21884379 is a deficient number, since it is larger than the sum of its proper divisors (9947493).

21884379 is a wasteful number, since it uses less digits than its factorization.

21884379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 663177.

The product of its digits is 96768, while the sum is 42.

The square root of 21884379 is about 4678.0742832922. The cubic root of 21884379 is about 279.7122000324.

The spelling of 21884379 in words is "twenty-one million, eight hundred eighty-four thousand, three hundred seventy-nine".