21200434 has 16 divisors (see below), whose sum is σ = 33281280. Its totient is φ = 10109440.

The previous prime is 21200401. The next prime is 21200461. The reversal of 21200434 is 43400212.

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, 29127 + ... + 29845.

It is an arithmetic number, because the mean of its divisors is an integer number (2080080).

Almost surely, 2^21200434 is an apocalyptic number.

21200434 is a deficient number, since it is larger than the sum of its proper divisors (12080846).

21200434 is a wasteful number, since it uses less digits than its factorization.

21200434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1385.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 21200434 is about 4604.3929024357. The cubic root of 21200434 is about 276.7673893359.

Adding to 21200434 its reverse (43400212), we get a palindrome (64600646).

The spelling of 21200434 in words is "twenty-one million, two hundred thousand, four hundred thirty-four".