12913321 has 2 divisors, whose sum is σ = 12913322. Its totient is φ = 12913320.

The previous prime is 12913289. The next prime is 12913337. The reversal of 12913321 is 12331921.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 12880921 + 32400 = 3589^2 + 180^2 .

It is a cyclic number.

It is not a de Polignac number, because 12913321 - 2⁵ = 12913289 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 12913292 and 12913301.

It is not a weakly prime, because it can be changed into another prime (12913921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6456660 + 6456661.

It is an arithmetic number, because the mean of its divisors is an integer number (6456661).

Almost surely, 2^12913321 is an apocalyptic number.

It is an amenable number.

12913321 is a deficient number, since it is larger than the sum of its proper divisors (1).

12913321 is an equidigital number, since it uses as much as digits as its factorization.

12913321 is an evil number, because the sum of its binary digits is even.

The product of its digits is 324, while the sum is 22.

The square root of 12913321 is about 3593.5109572673. The cubic root of 12913321 is about 234.6097097891.

The spelling of 12913321 in words is "twelve million, nine hundred thirteen thousand, three hundred twenty-one".