12221143 has 4 divisors (see below), whose sum is σ = 13332168. Its totient is φ = 11110120.

The previous prime is 12221117. The next prime is 12221171. The reversal of 12221143 is 34112221.

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 12221143 - 2¹³ = 12212951 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 (12221173) 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, 555496 + ... + 555517.

It is an arithmetic number, because the mean of its divisors is an integer number (3333042).

Almost surely, 2^12221143 is an apocalyptic number.

12221143 is a deficient number, since it is larger than the sum of its proper divisors (1111025).

12221143 is a wasteful number, since it uses less digits than its factorization.

12221143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111024.

The product of its digits is 96, while the sum is 16.

The square root of 12221143 is about 3495.8751407909. The cubic root of 12221143 is about 230.3406609078.

Adding to 12221143 its reverse (34112221), we get a palindrome (46333364).

The spelling of 12221143 in words is "twelve million, two hundred twenty-one thousand, one hundred forty-three".