4227221 has 4 divisors (see below), whose sum is σ = 4231500. Its totient is φ = 4222944.

The previous prime is 4227187. The next prime is 4227229. The reversal of 4227221 is 1227224.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2992900 + 1234321 = 1730^2 + 1111^2 .

It is a cyclic number.

It is not a de Polignac number, because 4227221 - 2²² = 32917 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4227193 and 4227202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4227229) 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, 185 + ... + 2913.

It is an arithmetic number, because the mean of its divisors is an integer number (1057875).

Almost surely, 2^4227221 is an apocalyptic number.

It is an amenable number.

4227221 is a deficient number, since it is larger than the sum of its proper divisors (4279).

4227221 is a wasteful number, since it uses less digits than its factorization.

4227221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278.

The product of its digits is 448, while the sum is 20.

The square root of 4227221 is about 2056.0206711023. The cubic root of 4227221 is about 161.6906788768.

The spelling of 4227221 in words is "four million, two hundred twenty-seven thousand, two hundred twenty-one".