21859004 has 12 divisors (see below), whose sum is σ = 38286528. Its totient is φ = 10920000.

The previous prime is 21859003. The next prime is 21859009. The reversal of 21859004 is 40095812.

It is a super-3 number, since 3×21859004³ (a number of 23 digits) contains 333 as substring.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21859003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6404 + ... + 9204.

It is an arithmetic number, because the mean of its divisors is an integer number (3190544).

Almost surely, 2^21859004 is an apocalyptic number.

It is an amenable number.

21859004 is a deficient number, since it is larger than the sum of its proper divisors (16427524).

21859004 is a wasteful number, since it uses less digits than its factorization.

21859004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4756 (or 4754 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21859004 is about 4675.3613764072. The cubic root of 21859004 is about 279.6040491895.

The spelling of 21859004 in words is "twenty-one million, eight hundred fifty-nine thousand, four".