12021822 has 36 divisors (see below), whose sum is σ = 27681576. Its totient is φ = 3769920.

The previous prime is 12021817. The next prime is 12021857. The reversal of 12021822 is 22812021.

It is a happy number.

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 = 12021795 and 12021804.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 4047 + ... + 6357.

Almost surely, 2^12021822 is an apocalyptic number.

12021822 is the 1734-th decagonal number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021822, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13840788).

12021822 is an abundant number, since it is smaller than the sum of its proper divisors (15659754).

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

12021822 is a wasteful number, since it uses less digits than its factorization.

12021822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353 (or 2333 counting only the distinct ones).

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

The square root of 12021822 is about 3467.2499188838. The cubic root of 12021822 is about 229.0815419966.

Adding to 12021822 its reverse (22812021), we get a palindrome (34833843).

The spelling of 12021822 in words is "twelve million, twenty-one thousand, eight hundred twenty-two".