12021288 has 16 divisors (see below), whose sum is σ = 30053280. Its totient is φ = 4007088.

The previous prime is 12021287. The next prime is 12021299. The reversal of 12021288 is 88212021.

It is a super-2 number, since 2×12021288² = 289022730357888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 500887 = 12021288 / (1 + 2 + 0 + 2 + 1 + 2 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (12021287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 250420 + ... + 250467.

It is an arithmetic number, because the mean of its divisors is an integer number (1878330).

Almost surely, 2^12021288 is an apocalyptic number.

It is an amenable number.

12021288 is an abundant number, since it is smaller than the sum of its proper divisors (18031992).

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

12021288 is a wasteful number, since it uses less digits than its factorization.

12021288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500896 (or 500892 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The square root of 12021288 is about 3467.1729117539. The cubic root of 12021288 is about 229.0781500716.

The spelling of 12021288 in words is "twelve million, twenty-one thousand, two hundred eighty-eight".