13207221 has 12 divisors (see below), whose sum is σ = 19906848. Its totient is φ = 8421864.

The previous prime is 13207217. The next prime is 13207247. The reversal of 13207221 is 12270231.

13207221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13207221 - 2² = 13207217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13207194 and 13207203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13207291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 31695 + ... + 32108.

It is an arithmetic number, because the mean of its divisors is an integer number (1658904).

Almost surely, 2^13207221 is an apocalyptic number.

It is an amenable number.

13207221 is a deficient number, since it is larger than the sum of its proper divisors (6699627).

13207221 is a wasteful number, since it uses less digits than its factorization.

13207221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63832 (or 63829 counting only the distinct ones).

The product of its (nonzero) digits is 168, while the sum is 18.

The square root of 13207221 is about 3634.1740464650. The cubic root of 13207221 is about 236.3762372294.

Adding to 13207221 its reverse (12270231), we get a palindrome (25477452).

The spelling of 13207221 in words is "thirteen million, two hundred seven thousand, two hundred twenty-one".