13140221 has 2 divisors, whose sum is σ = 13140222. Its totient is φ = 13140220.

The previous prime is 13140209. The next prime is 13140271. The reversal of 13140221 is 12204131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12355225 + 784996 = 3515^2 + 886^2 .

It is a cyclic number.

It is not a de Polignac number, because 13140221 - 2⁶ = 13140157 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 13140196 and 13140205.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13140271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6570110 + 6570111.

It is an arithmetic number, because the mean of its divisors is an integer number (6570111).

Almost surely, 2^13140221 is an apocalyptic number.

It is an amenable number.

13140221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13140221 is an equidigital number, since it uses as much as digits as its factorization.

13140221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 13140221 is about 3624.9442754338. The cubic root of 13140221 is about 235.9758485771.

Adding to 13140221 its reverse (12204131), we get a palindrome (25344352).

The spelling of 13140221 in words is "thirteen million, one hundred forty thousand, two hundred twenty-one".