13446221 has 4 divisors (see below), whose sum is σ = 13466592. Its totient is φ = 13425852.

The previous prime is 13446217. The next prime is 13446239. The reversal of 13446221 is 12264431.

13446221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12264431 = 1109 ⋅11059.

It is a cyclic number.

It is not a de Polignac number, because 13446221 - 2² = 13446217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13446211) 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, 9161 + ... + 10526.

It is an arithmetic number, because the mean of its divisors is an integer number (3366648).

Almost surely, 2^13446221 is an apocalyptic number.

It is an amenable number.

13446221 is a deficient number, since it is larger than the sum of its proper divisors (20371).

13446221 is an equidigital number, since it uses as much as digits as its factorization.

13446221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20370.

The product of its digits is 1152, while the sum is 23.

The square root of 13446221 is about 3666.9089162399. The cubic root of 13446221 is about 237.7935561211.

The spelling of 13446221 in words is "thirteen million, four hundred forty-six thousand, two hundred twenty-one".