13407221 has 4 divisors (see below), whose sum is σ = 13839744. Its totient is φ = 12974700.

The previous prime is 13407197. The next prime is 13407241. The reversal of 13407221 is 12270431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 13407221 - 2⁶ = 13407157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 13407193 and 13407202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13407241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216215 + ... + 216276.

It is an arithmetic number, because the mean of its divisors is an integer number (3459936).

Almost surely, 2^13407221 is an apocalyptic number.

It is an amenable number.

13407221 is a deficient number, since it is larger than the sum of its proper divisors (432523).

13407221 is an equidigital number, since it uses as much as digits as its factorization.

13407221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 432522.

The product of its (nonzero) digits is 336, while the sum is 20.

The square root of 13407221 is about 3661.5872241420. The cubic root of 13407221 is about 237.5634312568.

Adding to 13407221 its reverse (12270431), we get a palindrome (25677652).

The spelling of 13407221 in words is "thirteen million, four hundred seven thousand, two hundred twenty-one".