21234343 has 24 divisors (see below), whose sum is σ = 25693200. Its totient is φ = 17432064.

The previous prime is 21234307. The next prime is 21234347. The reversal of 21234343 is 34343212.

It is a happy number.

21234343 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It is a de Polignac number, because none of the positive numbers 2^k-21234343 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21234347) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 54393 + ... + 54781.

It is an arithmetic number, because the mean of its divisors is an integer number (1070550).

Almost surely, 2^21234343 is an apocalyptic number.

21234343 is a deficient number, since it is larger than the sum of its proper divisors (4458857).

21234343 is a wasteful number, since it uses less digits than its factorization.

21234343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 451 (or 438 counting only the distinct ones).

The product of its digits is 1728, while the sum is 22.

The square root of 21234343 is about 4608.0736756263. The cubic root of 21234343 is about 276.9148691201.

Adding to 21234343 its reverse (34343212), we get a palindrome (55577555).

The spelling of 21234343 in words is "twenty-one million, two hundred thirty-four thousand, three hundred forty-three".