21084119 has 4 divisors (see below), whose sum is σ = 24096144. Its totient is φ = 18072096.

The previous prime is 21084113. The next prime is 21084139. The reversal of 21084119 is 91148012.

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

It is not a de Polignac number, because 21084119 - 2⁴ = 21084103 is a prime.

It is a super-2 number, since 2×21084119² = 889080148012322, 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 (21084113) 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, 1506002 + ... + 1506015.

It is an arithmetic number, because the mean of its divisors is an integer number (6024036).

Almost surely, 2^21084119 is an apocalyptic number.

21084119 is a deficient number, since it is larger than the sum of its proper divisors (3012025).

21084119 is an equidigital number, since it uses as much as digits as its factorization.

21084119 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3012024.

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

The square root of 21084119 is about 4591.7446575349. The cubic root of 21084119 is about 276.2603045507.

The spelling of 21084119 in words is "twenty-one million, eighty-four thousand, one hundred nineteen".