4167221 has 4 divisors (see below), whose sum is σ = 4173600. Its totient is φ = 4160844.

The previous prime is 4167197. The next prime is 4167223. The reversal of 4167221 is 1227614.

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: 1227614 = 2 ⋅613807.

It is a cyclic number.

It is not a de Polignac number, because 4167221 - 2⁶ = 4167157 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 (4167223) 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, 2081 + ... + 3558.

It is an arithmetic number, because the mean of its divisors is an integer number (1043400).

Almost surely, 2^4167221 is an apocalyptic number.

It is an amenable number.

4167221 is a deficient number, since it is larger than the sum of its proper divisors (6379).

4167221 is an equidigital number, since it uses as much as digits as its factorization.

4167221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6378.

The product of its digits is 672, while the sum is 23.

The square root of 4167221 is about 2041.3772311849. The cubic root of 4167221 is about 160.9220331572.

The spelling of 4167221 in words is "four million, one hundred sixty-seven thousand, two hundred twenty-one".