12221021100222 has 72 divisors (see below), whose sum is σ = 29126181743568. Its totient is φ = 3700629725760.

The previous prime is 12221021100203. The next prime is 12221021100229. The reversal of 12221021100222 is 22200112012221.

It is a happy number.

12221021100222 is a `hidden beast` number, since 1 + 22 + 210 + 211 + 0 + 0 + 222 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 12221021100195 and 12221021100204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12221021100229) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 924978 + ... + 5029674.

It is an arithmetic number, because the mean of its divisors is an integer number (404530301994).

Almost surely, 2^{12221021100222} is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12221021100222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14563090871784).

12221021100222 is an abundant number, since it is smaller than the sum of its proper divisors (16905160643346).

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

12221021100222 is a wasteful number, since it uses less digits than its factorization.

12221021100222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4106094 (or 4106080 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 12221021100222 its reverse (22200112012221), we get a palindrome (34421133112443).

The spelling of 12221021100222 in words is "twelve trillion, two hundred twenty-one billion, twenty-one million, one hundred thousand, two hundred twenty-two".