12001021122222 has 64 divisors (see below), whose sum is σ = 29214104325120. Its totient is φ = 3621583094400.

The previous prime is 12001021122221. The next prime is 12001021122239. The reversal of 12001021122222 is 22222112010021.

It is a happy number.

12001021122222 is a `hidden beast` number, since 1 + 200 + 10 + 211 + 22 + 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 = 12001021122195 and 12001021122204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12001021122221) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 41773318 + ... + 42059625.

It is an arithmetic number, because the mean of its divisors is an integer number (456470380080).

Almost surely, 2^{12001021122222} is an apocalyptic number.

12001021122222 is an abundant number, since it is smaller than the sum of its proper divisors (17213083202898).

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

12001021122222 is a wasteful number, since it uses less digits than its factorization.

12001021122222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 83833206 (or 83833200 counting only the distinct ones).

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

Adding to 12001021122222 its reverse (22222112010021), we get a palindrome (34223133132243).

The spelling of 12001021122222 in words is "twelve trillion, one billion, twenty-one million, one hundred twenty-two thousand, two hundred twenty-two".