12021109 has 4 divisors (see below), whose sum is σ = 12435660. Its totient is φ = 11606560.

The previous prime is 12021071. The next prime is 12021131. The reversal of 12021109 is 90112021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 90112021 = 83 ⋅1085687.

It can be written as a sum of positive squares in 2 ways, for example, as 5880625 + 6140484 = 2425^2 + 2478^2 .

It is a cyclic number.

It is not a de Polignac number, because 12021109 - 2¹⁵ = 11988341 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12021092 and 12021101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12021179) 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, 207232 + ... + 207289.

It is an arithmetic number, because the mean of its divisors is an integer number (3108915).

Almost surely, 2^12021109 is an apocalyptic number.

It is an amenable number.

12021109 is a deficient number, since it is larger than the sum of its proper divisors (414551).

12021109 is an equidigital number, since it uses as much as digits as its factorization.

12021109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414550.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 12021109 is about 3467.1470981197. The cubic root of 12021109 is about 229.0770130556.

The spelling of 12021109 in words is "twelve million, twenty-one thousand, one hundred nine".