12221139 has 12 divisors (see below), whose sum is σ = 18955464. Its totient is φ = 6983424.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221139 is 93112221.

It is not a de Polignac number, because 12221139 - 2⁵ = 12221107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221179) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41422 + ... + 41715.

It is an arithmetic number, because the mean of its divisors is an integer number (1579622).

Almost surely, 2^12221139 is an apocalyptic number.

12221139 is a deficient number, since it is larger than the sum of its proper divisors (6734325).

12221139 is an equidigital number, since it uses as much as digits as its factorization.

12221139 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83154 (or 83147 counting only the distinct ones).

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

The square root of 12221139 is about 3495.8745686881. The cubic root of 12221139 is about 230.3406357775.

The spelling of 12221139 in words is "twelve million, two hundred twenty-one thousand, one hundred thirty-nine".