13120121 has 4 divisors (see below), whose sum is σ = 14994432. Its totient is φ = 11245812.

The previous prime is 13120111. The next prime is 13120139. The reversal of 13120121 is 12102131.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12102131 = 89 ⋅135979.

It is a cyclic number.

It is not a de Polignac number, because 13120121 - 2⁶ = 13120057 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13120111) 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, 937145 + ... + 937158.

It is an arithmetic number, because the mean of its divisors is an integer number (3748608).

Almost surely, 2^13120121 is an apocalyptic number.

It is an amenable number.

13120121 is a deficient number, since it is larger than the sum of its proper divisors (1874311).

13120121 is an equidigital number, since it uses as much as digits as its factorization.

13120121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1874310.

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

The square root of 13120121 is about 3622.1707579848. The cubic root of 13120121 is about 235.8554666582.

Adding to 13120121 its reverse (12102131), we get a palindrome (25222252).

The spelling of 13120121 in words is "thirteen million, one hundred twenty thousand, one hundred twenty-one".