4156221 has 8 divisors (see below), whose sum is σ = 5559424. Its totient is φ = 2761920.

The previous prime is 4156219. The next prime is 4156249. The reversal of 4156221 is 1226514.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4156221 - 2¹ = 4156219 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 (4156291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1045 + ... + 3066.

It is an arithmetic number, because the mean of its divisors is an integer number (694928).

Almost surely, 2^4156221 is an apocalyptic number.

It is an amenable number.

4156221 is a deficient number, since it is larger than the sum of its proper divisors (1403203).

4156221 is a wasteful number, since it uses less digits than its factorization.

4156221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4451.

The product of its digits is 480, while the sum is 21.

The square root of 4156221 is about 2038.6811913588. The cubic root of 4156221 is about 160.7803158376.

The spelling of 4156221 in words is "four million, one hundred fifty-six thousand, two hundred twenty-one".