13007221 has 2 divisors, whose sum is σ = 13007222. Its totient is φ = 13007220.

The previous prime is 13007219. The next prime is 13007231. The reversal of 13007221 is 12270031.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6812100 + 6195121 = 2610^2 + 2489^2 .

It is a cyclic number.

It is not a de Polignac number, because 13007221 - 2¹ = 13007219 is a prime.

Together with 13007219, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 13007195 and 13007204.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13007231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6503610 + 6503611.

It is an arithmetic number, because the mean of its divisors is an integer number (6503611).

Almost surely, 2^13007221 is an apocalyptic number.

It is an amenable number.

13007221 is a deficient number, since it is larger than the sum of its proper divisors (1).

13007221 is an equidigital number, since it uses as much as digits as its factorization.

13007221 is an evil number, because the sum of its binary digits is even.

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

The square root of 13007221 is about 3606.5525089759. The cubic root of 13007221 is about 235.1769965798.

Adding to 13007221 its reverse (12270031), we get a palindrome (25277252).

The spelling of 13007221 in words is "thirteen million, seven thousand, two hundred twenty-one".