12181219 has 4 divisors (see below), whose sum is σ = 12206520. Its totient is φ = 12155920.

The previous prime is 12181217. The next prime is 12181243. The reversal of 12181219 is 91218121.

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 12181219 - 2¹ = 12181217 is a prime.

It is a super-2 number, since 2×12181219² = 296764192651922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12181193 and 12181202.

It is not an unprimeable number, because it can be changed into a prime (12181217) 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, 11914 + ... + 12895.

It is an arithmetic number, because the mean of its divisors is an integer number (3051630).

Almost surely, 2^12181219 is an apocalyptic number.

12181219 is a deficient number, since it is larger than the sum of its proper divisors (25301).

12181219 is an equidigital number, since it uses as much as digits as its factorization.

12181219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25300.

The product of its digits is 288, while the sum is 25.

The square root of 12181219 is about 3490.1603115043. The cubic root of 12181219 is about 230.0895618435.

The spelling of 12181219 in words is "twelve million, one hundred eighty-one thousand, two hundred nineteen".