13070221 has 2 divisors, whose sum is σ = 13070222. Its totient is φ = 13070220.

The previous prime is 13070207. The next prime is 13070231. The reversal of 13070221 is 12207031.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10465225 + 2604996 = 3235^2 + 1614^2 .

It is an emirp because it is prime and its reverse (12207031) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 13070221 - 2¹³ = 13062029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13070195 and 13070204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13070231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6535110 + 6535111.

It is an arithmetic number, because the mean of its divisors is an integer number (6535111).

Almost surely, 2^13070221 is an apocalyptic number.

It is an amenable number.

13070221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13070221 is an equidigital number, since it uses as much as digits as its factorization.

13070221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 13070221 is about 3615.2760613818. The cubic root of 13070221 is about 235.5560756172.

Adding to 13070221 its reverse (12207031), we get a palindrome (25277252).

The spelling of 13070221 in words is "thirteen million, seventy thousand, two hundred twenty-one".