12021089 has 4 divisors (see below), whose sum is σ = 12247956. Its totient is φ = 11794224.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021089 is 98012021.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 7246864 + 4774225 = 2692^2 + 2185^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12021089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12021029) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113354 + ... + 113459.

It is an arithmetic number, because the mean of its divisors is an integer number (3061989).

Almost surely, 2^12021089 is an apocalyptic number.

It is an amenable number.

12021089 is a deficient number, since it is larger than the sum of its proper divisors (226867).

12021089 is an equidigital number, since it uses as much as digits as its factorization.

12021089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226866.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 12021089 is about 3467.1442139028. The cubic root of 12021089 is about 229.0768860140.

The spelling of 12021089 in words is "twelve million, twenty-one thousand, eighty-nine".