13728348121 has 2 divisors, whose sum is σ = 13728348122. Its totient is φ = 13728348120.

The previous prime is 13728348061. The next prime is 13728348131. The reversal of 13728348121 is 12184382731.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11456491225 + 2271856896 = 107035^2 + 47664^2 .

It is a cyclic number.

It is not a de Polignac number, because 13728348121 - 2⁷ = 13728347993 is a prime.

It is not a weakly prime, because it can be changed into another prime (13728348131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6864174060 + 6864174061.

It is an arithmetic number, because the mean of its divisors is an integer number (6864174061).

Almost surely, 2^13728348121 is an apocalyptic number.

It is an amenable number.

13728348121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13728348121 is an equidigital number, since it uses as much as digits as its factorization.

13728348121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 64512, while the sum is 40.

The spelling of 13728348121 in words is "thirteen billion, seven hundred twenty-eight million, three hundred forty-eight thousand, one hundred twenty-one".