12021366 has 48 divisors (see below), whose sum is σ = 28892160. Its totient is φ = 3321360.

The previous prime is 12021353. The next prime is 12021367. The reversal of 12021366 is 66312021.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021367) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 8455 + ... + 9773.

It is an arithmetic number, because the mean of its divisors is an integer number (601920).

Almost surely, 2^12021366 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12021366, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14446080).

12021366 is an abundant number, since it is smaller than the sum of its proper divisors (16870794).

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

12021366 is a wasteful number, since it uses less digits than its factorization.

12021366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1369 (or 1362 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 21.

The square root of 12021366 is about 3467.1841600930. The cubic root of 12021366 is about 229.0786455276.

Adding to 12021366 its reverse (66312021), we get a palindrome (78333387).

The spelling of 12021366 in words is "twelve million, twenty-one thousand, three hundred sixty-six".