13280921 has 2 divisors, whose sum is σ = 13280922. Its totient is φ = 13280920.

The previous prime is 13280881. The next prime is 13280933. The reversal of 13280921 is 12908231.

13280921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11485321 + 1795600 = 3389^2 + 1340^2 .

It is a cyclic number.

It is not a de Polignac number, because 13280921 - 2¹⁸ = 13018777 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (13280951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6640460 + 6640461.

It is an arithmetic number, because the mean of its divisors is an integer number (6640461).

Almost surely, 2^13280921 is an apocalyptic number.

It is an amenable number.

13280921 is a deficient number, since it is larger than the sum of its proper divisors (1).

13280921 is an equidigital number, since it uses as much as digits as its factorization.

13280921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 13280921 is about 3644.2997955712. The cubic root of 13280921 is about 236.8151038215.

The spelling of 13280921 in words is "thirteen million, two hundred eighty thousand, nine hundred twenty-one".