12021145 has 4 divisors (see below), whose sum is σ = 14425380. Its totient is φ = 9616912.

The previous prime is 12021131. The next prime is 12021179. The reversal of 12021145 is 54112021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54112021 = 1741 ⋅31081.

It can be written as a sum of positive squares in 2 ways, for example, as 6859161 + 5161984 = 2619^2 + 2272^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021145 - 2⁷ = 12021017 is a prime.

It is a super-2 number, since 2×12021145² = 289015854222050, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1202110 + ... + 1202119.

It is an arithmetic number, because the mean of its divisors is an integer number (3606345).

Almost surely, 2^12021145 is an apocalyptic number.

It is an amenable number.

12021145 is a deficient number, since it is larger than the sum of its proper divisors (2404235).

12021145 is an equidigital number, since it uses as much as digits as its factorization.

12021145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2404234.

The product of its (nonzero) digits is 80, while the sum is 16.

The square root of 12021145 is about 3467.1522897040. The cubic root of 12021145 is about 229.0772417301.

Adding to 12021145 its reverse (54112021), we get a palindrome (66133166).

The spelling of 12021145 in words is "twelve million, twenty-one thousand, one hundred forty-five".