21884536 has 16 divisors (see below), whose sum is σ = 41086800. Its totient is φ = 10928064.

The previous prime is 21884521. The next prime is 21884537. The reversal of 21884536 is 63548812.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 21884495 and 21884504.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21884537) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7821 + ... + 10243.

It is an arithmetic number, because the mean of its divisors is an integer number (2567925).

Almost surely, 2^21884536 is an apocalyptic number.

It is an amenable number.

21884536 is a deficient number, since it is larger than the sum of its proper divisors (19202264).

21884536 is a wasteful number, since it uses less digits than its factorization.

21884536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3558 (or 3554 counting only the distinct ones).

The product of its digits is 46080, while the sum is 37.

The square root of 21884536 is about 4678.0910636712. The cubic root of 21884536 is about 279.7128689222.

It can be divided in two parts, 2188 and 4536, that added together give a square (6724 = 82²).

The spelling of 21884536 in words is "twenty-one million, eight hundred eighty-four thousand, five hundred thirty-six".