21144182 has 4 divisors (see below), whose sum is σ = 31716276. Its totient is φ = 10572090.

The previous prime is 21144181. The next prime is 21144187. The reversal of 21144182 is 28144112.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21144181) by changing a digit.

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 as a sum of consecutive naturals, namely, 5286044 + ... + 5286047.

It is an arithmetic number, because the mean of its divisors is an integer number (7929069).

Almost surely, 2^21144182 is an apocalyptic number.

21144182 is a deficient number, since it is larger than the sum of its proper divisors (10572094).

21144182 is a wasteful number, since it uses less digits than its factorization.

21144182 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10572093.

The product of its digits is 512, while the sum is 23.

The square root of 21144182 is about 4598.2803307323. The cubic root of 21144182 is about 276.5223863448.

Adding to 21144182 its reverse (28144112), we get a palindrome (49288294).

The spelling of 21144182 in words is "twenty-one million, one hundred forty-four thousand, one hundred eighty-two".