12219231 has 4 divisors (see below), whose sum is σ = 16292312. Its totient is φ = 8146152.

The previous prime is 12219169. The next prime is 12219247. The reversal of 12219231 is 13291221.

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

It is not a de Polignac number, because 12219231 - 2¹⁰ = 12218207 is a prime.

It is a super-2 number, since 2×12219231² = 298619212462722, 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 = 12219198 and 12219207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12219631) 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, 2036536 + ... + 2036541.

It is an arithmetic number, because the mean of its divisors is an integer number (4073078).

Almost surely, 2^12219231 is an apocalyptic number.

12219231 is a deficient number, since it is larger than the sum of its proper divisors (4073081).

12219231 is an equidigital number, since it uses as much as digits as its factorization.

12219231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4073080.

The product of its digits is 216, while the sum is 21.

The square root of 12219231 is about 3495.6016649498. The cubic root of 12219231 is about 230.3286480022.

The spelling of 12219231 in words is "twelve million, two hundred nineteen thousand, two hundred thirty-one".