14821221 has 4 divisors (see below), whose sum is σ = 19761632. Its totient is φ = 9880812.

The previous prime is 14821217. The next prime is 14821237. The reversal of 14821221 is 12212841.

14821221 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: 12212841 = 3 ⋅4070947.

It is not a de Polignac number, because 14821221 - 2² = 14821217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (14821211) 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, 2470201 + ... + 2470206.

It is an arithmetic number, because the mean of its divisors is an integer number (4940408).

Almost surely, 2^14821221 is an apocalyptic number.

It is an amenable number.

14821221 is a deficient number, since it is larger than the sum of its proper divisors (4940411).

14821221 is an equidigital number, since it uses as much as digits as its factorization.

14821221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4940410.

The product of its digits is 256, while the sum is 21.

The square root of 14821221 is about 3849.8338925206. The cubic root of 14821221 is about 245.6374956899.

The spelling of 14821221 in words is "fourteen million, eight hundred twenty-one thousand, two hundred twenty-one".