21230343 has 10 divisors (see below), whose sum is σ = 31714584. Its totient is φ = 14153508.

The previous prime is 21230329. The next prime is 21230359. The reversal of 21230343 is 34303212.

It is not a de Polignac number, because 21230343 - 2¹⁰ = 21229319 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 (21230303) 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 9 ways as a sum of consecutive naturals, for example, 130971 + ... + 131132.

Almost surely, 2^21230343 is an apocalyptic number.

21230343 is a deficient number, since it is larger than the sum of its proper divisors (10484241).

21230343 is an equidigital number, since it uses as much as digits as its factorization.

21230343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 262115 (or 262106 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 18.

The square root of 21230343 is about 4607.6396343464. The cubic root of 21230343 is about 276.8974801661.

Adding to 21230343 its reverse (34303212), we get a palindrome (55533555).

The spelling of 21230343 in words is "twenty-one million, two hundred thirty thousand, three hundred forty-three".