13198121 has 4 divisors (see below), whose sum is σ = 13206144. Its totient is φ = 13190100.

The previous prime is 13198109. The next prime is 13198127. The reversal of 13198121 is 12189131.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12189131 = 83 ⋅146857.

It is a cyclic number.

It is not a de Polignac number, because 13198121 - 2⁶ = 13198057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13198127) 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, 545 + ... + 5166.

It is an arithmetic number, because the mean of its divisors is an integer number (3301536).

Almost surely, 2^13198121 is an apocalyptic number.

It is an amenable number.

13198121 is a deficient number, since it is larger than the sum of its proper divisors (8023).

13198121 is an equidigital number, since it uses as much as digits as its factorization.

13198121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8022.

The product of its digits is 432, while the sum is 26.

The square root of 13198121 is about 3632.9218268496. The cubic root of 13198121 is about 236.3219356728.

The spelling of 13198121 in words is "thirteen million, one hundred ninety-eight thousand, one hundred twenty-one".