21839043 has 16 divisors (see below), whose sum is σ = 29675520. Its totient is φ = 14283744.

The previous prime is 21839023. The next prime is 21839053. The reversal of 21839043 is 34093812.

It is not a de Polignac number, because 21839043 - 2⁵ = 21839011 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21839043.

It is not an unprimeable number, because it can be changed into a prime (21839003) 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 15 ways as a sum of consecutive naturals, for example, 56830 + ... + 57212.

It is an arithmetic number, because the mean of its divisors is an integer number (1854720).

Almost surely, 2^21839043 is an apocalyptic number.

21839043 is a deficient number, since it is larger than the sum of its proper divisors (7836477).

21839043 is a wasteful number, since it uses less digits than its factorization.

21839043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 698.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 21839043 is about 4673.2261875497. The cubic root of 21839043 is about 279.5189145367.

The spelling of 21839043 in words is "twenty-one million, eight hundred thirty-nine thousand, forty-three".