12212443 has 4 divisors (see below), whose sum is σ = 12930840. Its totient is φ = 11494048.

The previous prime is 12212441. The next prime is 12212467. The reversal of 12212443 is 34421221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34421221 = 53 ⋅649457.

It is a cyclic number.

It is not a de Polignac number, because 12212443 - 2¹ = 12212441 is a prime.

It is a Duffinian number.

It is a plaindrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 12212443.

It is not an unprimeable number, because it can be changed into a prime (12212441) 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, 359173 + ... + 359206.

It is an arithmetic number, because the mean of its divisors is an integer number (3232710).

Almost surely, 2^12212443 is an apocalyptic number.

12212443 is a deficient number, since it is larger than the sum of its proper divisors (718397).

12212443 is an equidigital number, since it uses as much as digits as its factorization.

12212443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 718396.

The product of its digits is 384, while the sum is 19.

The square root of 12212443 is about 3494.6305956424. The cubic root of 12212443 is about 230.2859895494.

Adding to 12212443 its reverse (34421221), we get a palindrome (46633664).

It can be divided in two parts, 1221 and 2443, that multiplied together give a triangular number (2982903 = T₂₄₄₂).

The spelling of 12212443 in words is "twelve million, two hundred twelve thousand, four hundred forty-three".