12121369 has 4 divisors (see below), whose sum is σ = 13053796. Its totient is φ = 11188944.

The previous prime is 12121367. The next prime is 12121379. The reversal of 12121369 is 96312121.

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 2849344 + 9272025 = 1688^2 + 3045^2 .

It is not a de Polignac number, because 12121369 - 2¹ = 12121367 is a prime.

It is a super-2 number, since 2×12121369² = 293855172868322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12121367) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 466194 + ... + 466219.

It is an arithmetic number, because the mean of its divisors is an integer number (3263449).

Almost surely, 2^12121369 is an apocalyptic number.

It is an amenable number.

12121369 is a deficient number, since it is larger than the sum of its proper divisors (932427).

12121369 is an equidigital number, since it uses as much as digits as its factorization.

12121369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 932426.

The product of its digits is 648, while the sum is 25.

The square root of 12121369 is about 3481.5756490417. The cubic root of 12121369 is about 229.7121098687.

The spelling of 12121369 in words is "twelve million, one hundred twenty-one thousand, three hundred sixty-nine".