4221856 has 12 divisors (see below), whose sum is σ = 8311842. Its totient is φ = 2110912.

The previous prime is 4221851. The next prime is 4221883. The reversal of 4221856 is 6581224.

It can be written as a sum of positive squares in only one way, i.e., 3549456 + 672400 = 1884^2 + 820^2 .

It is not an unprimeable number, because it can be changed into a prime (4221851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65935 + ... + 65998.

Almost surely, 2^4221856 is an apocalyptic number.

It is an amenable number.

4221856 is a deficient number, since it is larger than the sum of its proper divisors (4089986).

4221856 is a wasteful number, since it uses less digits than its factorization.

4221856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131943 (or 131935 counting only the distinct ones).

The product of its digits is 3840, while the sum is 28.

The square root of 4221856 is about 2054.7155520899. The cubic root of 4221856 is about 161.6222463900.

It can be divided in two parts, 422 and 1856, that added together give a triangular number (2278 = T₆₇).

The spelling of 4221856 in words is "four million, two hundred twenty-one thousand, eight hundred fifty-six".