21200043 has 16 divisors (see below), whose sum is σ = 29767680. Its totient is φ = 13394304.

The previous prime is 21200041. The next prime is 21200051. The reversal of 21200043 is 34000212.

It is not a de Polignac number, because 21200043 - 2¹ = 21200041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21200041) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6438 + ... + 9156.

It is an arithmetic number, because the mean of its divisors is an integer number (1860480).

Almost surely, 2^21200043 is an apocalyptic number.

21200043 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21200043 is a deficient number, since it is larger than the sum of its proper divisors (8567637).

21200043 is a wasteful number, since it uses less digits than its factorization.

21200043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2858.

The product of its (nonzero) digits is 48, while the sum is 12.

The square root of 21200043 is about 4604.3504427878. The cubic root of 21200043 is about 276.7656878501.

Adding to 21200043 its reverse (34000212), we get a palindrome (55200255).

The spelling of 21200043 in words is "twenty-one million, two hundred thousand, forty-three".