13205154420121 has 4 divisors (see below), whose sum is σ = 13486115152512. Its totient is φ = 12924193687732.

The previous prime is 13205154420113. The next prime is 13205154420179. The reversal of 13205154420121 is 12102445150231.

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 13205154420121 - 2³ = 13205154420113 is a prime.

It is a super-2 number, since 2×13205154420121² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13205154420421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140480366125 + ... + 140480366218.

It is an arithmetic number, because the mean of its divisors is an integer number (3371528788128).

Almost surely, 2^{13205154420121} is an apocalyptic number.

It is an amenable number.

13205154420121 is a deficient number, since it is larger than the sum of its proper divisors (280960732391).

13205154420121 is an equidigital number, since it uses as much as digits as its factorization.

13205154420121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280960732390.

The product of its (nonzero) digits is 9600, while the sum is 31.

Adding to 13205154420121 its reverse (12102445150231), we get a palindrome (25307599570352).

The spelling of 13205154420121 in words is "thirteen trillion, two hundred five billion, one hundred fifty-four million, four hundred twenty thousand, one hundred twenty-one".