21859084 has 12 divisors (see below), whose sum is σ = 41196064. Its totient is φ = 10088784.

The previous prime is 21859073. The next prime is 21859091. The reversal of 21859084 is 48095812.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 210132 + ... + 210235.

Almost surely, 2^21859084 is an apocalyptic number.

It is an amenable number.

21859084 is a deficient number, since it is larger than the sum of its proper divisors (19336980).

21859084 is a wasteful number, since it uses less digits than its factorization.

21859084 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 420384 (or 420382 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 21859084 is about 4675.3699318877. The cubic root of 21859084 is about 279.6043902891.

The spelling of 21859084 in words is "twenty-one million, eight hundred fifty-nine thousand, eighty-four".