21884845 has 16 divisors (see below), whose sum is σ = 27993600. Its totient is φ = 16386304.

The previous prime is 21884839. The next prime is 21884851. The reversal of 21884845 is 54848812.

It is an interprime number because it is at equal distance from previous prime (21884839) and next prime (21884851).

It is not a de Polignac number, because 21884845 - 2¹¹ = 21882797 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21884798 and 21884807.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 3381 + ... + 7429.

It is an arithmetic number, because the mean of its divisors is an integer number (1749600).

Almost surely, 2^21884845 is an apocalyptic number.

It is an amenable number.

21884845 is a deficient number, since it is larger than the sum of its proper divisors (6108755).

21884845 is a wasteful number, since it uses less digits than its factorization.

21884845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4124.

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

The square root of 21884845 is about 4678.1240898463. The cubic root of 21884845 is about 279.7141853901.

The spelling of 21884845 in words is "twenty-one million, eight hundred eighty-four thousand, eight hundred forty-five".