12211406 has 24 divisors (see below), whose sum is σ = 20018856. Its totient is φ = 5581440.

The previous prime is 12211403. The next prime is 12211421. The reversal of 12211406 is 60411221.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211403) 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 in 11 ways as a sum of consecutive naturals, for example, 21101 + ... + 21671.

It is an arithmetic number, because the mean of its divisors is an integer number (834119).

Almost surely, 2^12211406 is an apocalyptic number.

12211406 is a deficient number, since it is larger than the sum of its proper divisors (7807450).

12211406 is a wasteful number, since it uses less digits than its factorization.

12211406 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 644 (or 627 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 12211406 is about 3494.4822220180. The cubic root of 12211406 is about 230.2794712432.

Adding to 12211406 its reverse (60411221), we get a palindrome (72622627).

The spelling of 12211406 in words is "twelve million, two hundred eleven thousand, four hundred six".