12213543 has 4 divisors (see below), whose sum is σ = 16284728. Its totient is φ = 8142360.

The previous prime is 12213541. The next prime is 12213571. The reversal of 12213543 is 34531221.

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

It is not a de Polignac number, because 12213543 - 2¹ = 12213541 is a prime.

It is a super-2 number, since 2×12213543² = 298341265225698, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12213541) 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, 2035588 + ... + 2035593.

It is an arithmetic number, because the mean of its divisors is an integer number (4071182).

Almost surely, 2^12213543 is an apocalyptic number.

12213543 is a deficient number, since it is larger than the sum of its proper divisors (4071185).

12213543 is an equidigital number, since it uses as much as digits as its factorization.

12213543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4071184.

The product of its digits is 720, while the sum is 21.

The square root of 12213543 is about 3494.7879764014. The cubic root of 12213543 is about 230.2929034536.

Adding to 12213543 its reverse (34531221), we get a palindrome (46744764).

The spelling of 12213543 in words is "twelve million, two hundred thirteen thousand, five hundred forty-three".