12021055 has 4 divisors (see below), whose sum is σ = 14425272. Its totient is φ = 9616840.

The previous prime is 12021043. The next prime is 12021059. The reversal of 12021055 is 55012021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55012021 = 23 ⋅2391827.

It is not a de Polignac number, because 12021055 - 2⁹ = 12020543 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021059) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202101 + ... + 1202110.

It is an arithmetic number, because the mean of its divisors is an integer number (3606318).

Almost surely, 2^12021055 is an apocalyptic number.

12021055 is a deficient number, since it is larger than the sum of its proper divisors (2404217).

12021055 is an equidigital number, since it uses as much as digits as its factorization.

12021055 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404216.

The product of its (nonzero) digits is 100, while the sum is 16.

The square root of 12021055 is about 3467.1393107287. The cubic root of 12021055 is about 229.0766700429.

Adding to 12021055 its reverse (55012021), we get a palindrome (67033076).

The spelling of 12021055 in words is "twelve million, twenty-one thousand, fifty-five".