12121345 has 16 divisors (see below), whose sum is σ = 15333120. Its totient is φ = 9180864.

The previous prime is 12121337. The next prime is 12121367. The reversal of 12121345 is 54312121.

It is not a de Polignac number, because 12121345 - 2³ = 12121337 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12052 + ... + 13018.

It is an arithmetic number, because the mean of its divisors is an integer number (958320).

Almost surely, 2^12121345 is an apocalyptic number.

It is an amenable number.

12121345 is a deficient number, since it is larger than the sum of its proper divisors (3211775).

12121345 is a wasteful number, since it uses less digits than its factorization.

12121345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1104.

The product of its digits is 240, while the sum is 19.

The square root of 12121345 is about 3481.5722023247. The cubic root of 12121345 is about 229.7119582605.

Adding to 12121345 its reverse (54312121), we get a palindrome (66433466).

The spelling of 12121345 in words is "twelve million, one hundred twenty-one thousand, three hundred forty-five".