21804119 has 4 divisors (see below), whose sum is σ = 21891240. Its totient is φ = 21717000.

The previous prime is 21804113. The next prime is 21804121. The reversal of 21804119 is 91140812.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21804119 is a prime.

It is a super-2 number, since 2×21804119² = 950839210732322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21804113) 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, 43184 + ... + 43685.

It is an arithmetic number, because the mean of its divisors is an integer number (5472810).

Almost surely, 2^21804119 is an apocalyptic number.

21804119 is a deficient number, since it is larger than the sum of its proper divisors (87121).

21804119 is an equidigital number, since it uses as much as digits as its factorization.

21804119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87120.

The product of its (nonzero) digits is 576, while the sum is 26.

The square root of 21804119 is about 4669.4880875745. The cubic root of 21804119 is about 279.3698370824.

The spelling of 21804119 in words is "twenty-one million, eight hundred four thousand, one hundred nineteen".