13121233 has 4 divisors (see below), whose sum is σ = 13193908. Its totient is φ = 13048560.

The previous prime is 13121231. The next prime is 13121243. The reversal of 13121233 is 33212131.

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 3560769 + 9560464 = 1887^2 + 3092^2 .

It is a cyclic number.

It is not a de Polignac number, because 13121233 - 2¹ = 13121231 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13121231) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 36066 + ... + 36427.

It is an arithmetic number, because the mean of its divisors is an integer number (3298477).

Almost surely, 2^13121233 is an apocalyptic number.

It is an amenable number.

13121233 is a deficient number, since it is larger than the sum of its proper divisors (72675).

13121233 is an equidigital number, since it uses as much as digits as its factorization.

13121233 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72674.

The product of its digits is 108, while the sum is 16.

The square root of 13121233 is about 3622.3242538459. The cubic root of 13121233 is about 235.8621298048.

Adding to 13121233 its reverse (33212131), we get a palindrome (46333364).

The spelling of 13121233 in words is "thirteen million, one hundred twenty-one thousand, two hundred thirty-three".