12221310136 has 64 divisors (see below), whose sum is σ = 26496550080. Its totient is φ = 5176258560.

The previous prime is 12221310083. The next prime is 12221310137. The reversal of 12221310136 is 63101312221.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221310137) 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, 5501506 + ... + 5503726.

It is an arithmetic number, because the mean of its divisors is an integer number (414008595).

Almost surely, 2^12221310136 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 12221310136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13248275040).

12221310136 is an abundant number, since it is smaller than the sum of its proper divisors (14275239944).

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

12221310136 is a wasteful number, since it uses less digits than its factorization.

12221310136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3344 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 12221310136 its reverse (63101312221), we get a palindrome (75322622357).

The spelling of 12221310136 in words is "twelve billion, two hundred twenty-one million, three hundred ten thousand, one hundred thirty-six".