12001122 has 80 divisors (see below), whose sum is σ = 32408640. Its totient is φ = 3242592.

The previous prime is 12001117. The next prime is 12001139. The reversal of 12001122 is 22110021.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 21268 + ... + 21824.

It is an arithmetic number, because the mean of its divisors is an integer number (405108).

Almost surely, 2^12001122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12001122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16204320).

12001122 is an abundant number, since it is smaller than the sum of its proper divisors (20407518).

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

12001122 is a wasteful number, since it uses less digits than its factorization.

12001122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 588 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12001122 is about 3464.2635581029. The cubic root of 12001122 is about 228.9499836737.

Adding to 12001122 its reverse (22110021), we get a palindrome (34111143).

The spelling of 12001122 in words is "twelve million, one thousand, one hundred twenty-two".