4278221 has 4 divisors (see below), whose sum is σ = 4294752. Its totient is φ = 4261692.

The previous prime is 4278193. The next prime is 4278223. The reversal of 4278221 is 1228724.

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 4278221 - 2¹⁰ = 4277197 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 (4278223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7871 + ... + 8396.

It is an arithmetic number, because the mean of its divisors is an integer number (1073688).

Almost surely, 2^4278221 is an apocalyptic number.

It is an amenable number.

4278221 is a deficient number, since it is larger than the sum of its proper divisors (16531).

4278221 is a wasteful number, since it uses less digits than its factorization.

4278221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16530.

The product of its digits is 1792, while the sum is 26.

The square root of 4278221 is about 2068.3860858167. The cubic root of 4278221 is about 162.3383291482.

The spelling of 4278221 in words is "four million, two hundred seventy-eight thousand, two hundred twenty-one".