21843118 has 16 divisors (see below), whose sum is σ = 35841456. Its totient is φ = 9901440.

The previous prime is 21843053. The next prime is 21843121. The reversal of 21843118 is 81134812.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 8380 + ... + 10672.

It is an arithmetic number, because the mean of its divisors is an integer number (2240091).

Almost surely, 2^21843118 is an apocalyptic number.

21843118 is a deficient number, since it is larger than the sum of its proper divisors (13998338).

21843118 is a wasteful number, since it uses less digits than its factorization.

21843118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2739.

The product of its digits is 1536, while the sum is 28.

The square root of 21843118 is about 4673.6621615175. The cubic root of 21843118 is about 279.5362988262.

The spelling of 21843118 in words is "twenty-one million, eight hundred forty-three thousand, one hundred eighteen".