13012121 has 4 divisors (see below), whose sum is σ = 13027200. Its totient is φ = 12997044.

The previous prime is 13012117. The next prime is 13012141. The reversal of 13012121 is 12121031.

13012121 is digitally balanced in base 3, 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13012121 - 2² = 13012117 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13012141) 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, 6161 + ... + 7998.

It is an arithmetic number, because the mean of its divisors is an integer number (3256800).

Almost surely, 2^13012121 is an apocalyptic number.

It is an amenable number.

13012121 is a deficient number, since it is larger than the sum of its proper divisors (15079).

13012121 is an equidigital number, since it uses as much as digits as its factorization.

13012121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15078.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 13012121 is about 3607.2317641094. The cubic root of 13012121 is about 235.2065243478.

Adding to 13012121 its reverse (12121031), we get a palindrome (25133152).

The spelling of 13012121 in words is "thirteen million, twelve thousand, one hundred twenty-one".