13121121 has 16 divisors (see below), whose sum is σ = 18910080. Its totient is φ = 8044800.

The previous prime is 13121117. The next prime is 13121159. The reversal of 13121121 is 12112131.

13121121 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13121121 - 2² = 13121117 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13121097 and 13121106.

It is not an unprimeable number, because it can be changed into a prime (13121621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15220 + ... + 16058.

It is an arithmetic number, because the mean of its divisors is an integer number (1181880).

Almost surely, 2^13121121 is an apocalyptic number.

It is an amenable number.

13121121 is a deficient number, since it is larger than the sum of its proper divisors (5788959).

13121121 is a wasteful number, since it uses less digits than its factorization.

13121121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256.

The product of its digits is 12, while the sum is 12.

The square root of 13121121 is about 3622.3087941256. The cubic root of 13121121 is about 235.8614587135.

Adding to 13121121 its reverse (12112131), we get a palindrome (25233252).

The spelling of 13121121 in words is "thirteen million, one hundred twenty-one thousand, one hundred twenty-one".