12099121 has 4 divisors (see below), whose sum is σ = 12810852. Its totient is φ = 11387392.

The previous prime is 12099089. The next prime is 12099133. The reversal of 12099121 is 12199021.

12099121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 6150400 + 5948721 = 2480^2 + 2439^2 .

It is a cyclic number.

It is not a de Polignac number, because 12099121 - 2⁵ = 12099089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12099151) 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, 355840 + ... + 355873.

It is an arithmetic number, because the mean of its divisors is an integer number (3202713).

Almost surely, 2^12099121 is an apocalyptic number.

It is an amenable number.

12099121 is a deficient number, since it is larger than the sum of its proper divisors (711731).

12099121 is an equidigital number, since it uses as much as digits as its factorization.

12099121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711730.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 12099121 is about 3478.3790765240. The cubic root of 12099121 is about 229.5714831523.

The spelling of 12099121 in words is "twelve million, ninety-nine thousand, one hundred twenty-one".