21232243 has 4 divisors (see below), whose sum is σ = 22155408. Its totient is φ = 20309080.

The previous prime is 21232229. The next prime is 21232247. The reversal of 21232243 is 34223212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21232243 - 2⁹ = 21231731 is a prime.

It is a super-2 number, since 2×21232243² = 901616285622098, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21232243.

It is not an unprimeable number, because it can be changed into a prime (21232247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 461548 + ... + 461593.

It is an arithmetic number, because the mean of its divisors is an integer number (5538852).

Almost surely, 2^21232243 is an apocalyptic number.

21232243 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21232243 is a deficient number, since it is larger than the sum of its proper divisors (923165).

21232243 is an equidigital number, since it uses as much as digits as its factorization.

21232243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 923164.

The product of its digits is 576, while the sum is 19.

The square root of 21232243 is about 4607.8458090522. The cubic root of 21232243 is about 276.9057401916.

Adding to 21232243 its reverse (34223212), we get a palindrome (55455455).

The spelling of 21232243 in words is "twenty-one million, two hundred thirty-two thousand, two hundred forty-three".