13281380421121 has 4 divisors (see below), whose sum is σ = 13281388199892. Its totient is φ = 13281372642352.

The previous prime is 13281380420981. The next prime is 13281380421137. The reversal of 13281380421121 is 12112408318231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 3994246070721 + 9287134350400 = 1998561^2 + 3047480^2 .

It is a cyclic number.

It is not a de Polignac number, because 13281380421121 - 2³⁷ = 13143941467649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13281380421521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 93286 + ... + 5154751.

It is an arithmetic number, because the mean of its divisors is an integer number (3320347049973).

Almost surely, 2^{13281380421121} is an apocalyptic number.

It is an amenable number.

13281380421121 is a deficient number, since it is larger than the sum of its proper divisors (7778771).

13281380421121 is an equidigital number, since it uses as much as digits as its factorization.

13281380421121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7778770.

The product of its (nonzero) digits is 18432, while the sum is 37.

Adding to 13281380421121 its reverse (12112408318231), we get a palindrome (25393788739352).

The spelling of 13281380421121 in words is "thirteen trillion, two hundred eighty-one billion, three hundred eighty million, four hundred twenty-one thousand, one hundred twenty-one".