12221408 has 24 divisors (see below), whose sum is σ = 25328520. Its totient is φ = 5788800.

The previous prime is 12221401. The next prime is 12221413. The reversal of 12221408 is 80412221.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 12221408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221401) 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, 9443 + ... + 10658.

It is an arithmetic number, because the mean of its divisors is an integer number (1055355).

Almost surely, 2^12221408 is an apocalyptic number.

It is an amenable number.

12221408 is an abundant number, since it is smaller than the sum of its proper divisors (13107112).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12221408 is a wasteful number, since it uses less digits than its factorization.

12221408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20130 (or 20122 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

The square root of 12221408 is about 3495.9130423968. The cubic root of 12221408 is about 230.3423257775.

Adding to 12221408 its reverse (80412221), we get a palindrome (92633629).

The spelling of 12221408 in words is "twelve million, two hundred twenty-one thousand, four hundred eight".