4221664 has 12 divisors (see below), whose sum is σ = 8311464. Its totient is φ = 2110816.

The previous prime is 4221653. The next prime is 4221671. The reversal of 4221664 is 4661224.

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 65932 + ... + 65995.

It is an arithmetic number, because the mean of its divisors is an integer number (692622).

Almost surely, 2^4221664 is an apocalyptic number.

It is an amenable number.

4221664 is a deficient number, since it is larger than the sum of its proper divisors (4089800).

4221664 is a wasteful number, since it uses less digits than its factorization.

4221664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131937 (or 131929 counting only the distinct ones).

The product of its digits is 2304, while the sum is 25.

The square root of 4221664 is about 2054.6688297631. The cubic root of 4221664 is about 161.6197962874.

Adding to 4221664 its reverse (4661224), we get a palindrome (8882888).

The spelling of 4221664 in words is "four million, two hundred twenty-one thousand, six hundred sixty-four".