21143234 has 16 divisors (see below), whose sum is σ = 36410688. Its totient is φ = 9020112.

The previous prime is 21143207. The next prime is 21143251. The reversal of 21143234 is 43234112.

It is a Curzon number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 149 + ... + 6504.

It is an arithmetic number, because the mean of its divisors is an integer number (2275668).

Almost surely, 2^21143234 is an apocalyptic number.

21143234 is a deficient number, since it is larger than the sum of its proper divisors (15267454).

21143234 is a wasteful number, since it uses less digits than its factorization.

21143234 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6889.

The product of its digits is 576, while the sum is 20.

The square root of 21143234 is about 4598.1772475623. The cubic root of 21143234 is about 276.5182536533.

Adding to 21143234 its reverse (43234112), we get a palindrome (64377346).

The spelling of 21143234 in words is "twenty-one million, one hundred forty-three thousand, two hundred thirty-four".