12211142 has 4 divisors (see below), whose sum is σ = 18316716. Its totient is φ = 6105570.

The previous prime is 12211141. The next prime is 12211159. The reversal of 12211142 is 24111221.

It is a happy number.

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

It is a super-2 number, since 2×12211142² = 298223977888328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3052784 + ... + 3052787.

It is an arithmetic number, because the mean of its divisors is an integer number (4579179).

Almost surely, 2^12211142 is an apocalyptic number.

12211142 is a deficient number, since it is larger than the sum of its proper divisors (6105574).

12211142 is an equidigital number, since it uses as much as digits as its factorization.

12211142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6105573.

The product of its digits is 32, while the sum is 14.

The square root of 12211142 is about 3494.4444479774. Note that the first 5 decimals coincide. The cubic root of 12211142 is about 230.2778117504.

Adding to 12211142 its reverse (24111221), we get a palindrome (36322363).

The spelling of 12211142 in words is "twelve million, two hundred eleven thousand, one hundred forty-two".