13228121 has 2 divisors, whose sum is σ = 13228122. Its totient is φ = 13228120.

The previous prime is 13228097. The next prime is 13228141. The reversal of 13228121 is 12182231.

13228121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an a-pointer prime, because the next prime (13228141) can be obtained adding 13228121 to its sum of digits (20).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12250000 + 978121 = 3500^2 + 989^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13228121 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13228093 and 13228102.

It is not a weakly prime, because it can be changed into another prime (13228141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6614060 + 6614061.

It is an arithmetic number, because the mean of its divisors is an integer number (6614061).

Almost surely, 2^13228121 is an apocalyptic number.

It is an amenable number.

13228121 is a deficient number, since it is larger than the sum of its proper divisors (1).

13228121 is an equidigital number, since it uses as much as digits as its factorization.

13228121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 192, while the sum is 20.

The square root of 13228121 is about 3637.0483912096. The cubic root of 13228121 is about 236.5008574330.

The spelling of 13228121 in words is "thirteen million, two hundred twenty-eight thousand, one hundred twenty-one".