13204456121 has 4 divisors (see below), whose sum is σ = 13981188852. Its totient is φ = 12427723392.

The previous prime is 13204456099. The next prime is 13204456127. The reversal of 13204456121 is 12165440231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11355886096 + 1848570025 = 106564^2 + 42995^2 .

It is a cyclic number.

It is not a de Polignac number, because 13204456121 - 2²⁶ = 13137347257 is a prime.

It is a super-2 number, since 2×13204456121² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13204456127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 388366340 + ... + 388366373.

It is an arithmetic number, because the mean of its divisors is an integer number (3495297213).

Almost surely, 2^13204456121 is an apocalyptic number.

It is an amenable number.

13204456121 is a deficient number, since it is larger than the sum of its proper divisors (776732731).

13204456121 is an equidigital number, since it uses as much as digits as its factorization.

13204456121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 776732730.

The product of its (nonzero) digits is 5760, while the sum is 29.

Adding to 13204456121 its reverse (12165440231), we get a palindrome (25369896352).

The spelling of 13204456121 in words is "thirteen billion, two hundred four million, four hundred fifty-six thousand, one hundred twenty-one".