4187221 has 4 divisors (see below), whose sum is σ = 4202944. Its totient is φ = 4171500.

The previous prime is 4187213. The next prime is 4187233. The reversal of 4187221 is 1227814.

It is a happy number.

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 4187221 - 2³ = 4187213 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 (4187251) 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, 7455 + ... + 7996.

It is an arithmetic number, because the mean of its divisors is an integer number (1050736).

Almost surely, 2^4187221 is an apocalyptic number.

It is an amenable number.

4187221 is a deficient number, since it is larger than the sum of its proper divisors (15723).

4187221 is a wasteful number, since it uses less digits than its factorization.

4187221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15722.

The product of its digits is 896, while the sum is 25.

The square root of 4187221 is about 2046.2700212826. The cubic root of 4187221 is about 161.1790634041.

The spelling of 4187221 in words is "four million, one hundred eighty-seven thousand, two hundred twenty-one".