12221239 has 8 divisors (see below), whose sum is σ = 12598992. Its totient is φ = 11847360.

The previous prime is 12221233. The next prime is 12221243. The reversal of 12221239 is 93212221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12221239 - 2⁵ = 12221207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6232 + ... + 7954.

It is an arithmetic number, because the mean of its divisors is an integer number (1574874).

Almost surely, 2^12221239 is an apocalyptic number.

12221239 is a deficient number, since it is larger than the sum of its proper divisors (377753).

12221239 is a wasteful number, since it uses less digits than its factorization.

12221239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1937.

The product of its digits is 432, while the sum is 22.

The square root of 12221239 is about 3495.8888712315. Note that the first 4 decimals coincide. The cubic root of 12221239 is about 230.3412640332.

The spelling of 12221239 in words is "twelve million, two hundred twenty-one thousand, two hundred thirty-nine".