12221266408 has 64 divisors (see below), whose sum is σ = 26266705920. Its totient is φ = 5280844800.

The previous prime is 12221266403. The next prime is 12221266411. The reversal of 12221266408 is 80466212221.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is not an unprimeable number, because it can be changed into a prime (12221266403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 319593 + ... + 355783.

It is an arithmetic number, because the mean of its divisors is an integer number (410417280).

Almost surely, 2^12221266408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221266408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13133352960).

12221266408 is an abundant number, since it is smaller than the sum of its proper divisors (14045439512).

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

12221266408 is a wasteful number, since it uses less digits than its factorization.

12221266408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36418 (or 36414 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 34.

Adding to 12221266408 its reverse (80466212221), we get a palindrome (92687478629).

The spelling of 12221266408 in words is "twelve billion, two hundred twenty-one million, two hundred sixty-six thousand, four hundred eight".