4221518 has 32 divisors (see below), whose sum is σ = 7630848. Its totient is φ = 1713600.

The previous prime is 4221499. The next prime is 4221521. The reversal of 4221518 is 8151224.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 4221493 and 4221502.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30746 + ... + 30882.

It is an arithmetic number, because the mean of its divisors is an integer number (238464).

Almost surely, 2^4221518 is an apocalyptic number.

4221518 is a deficient number, since it is larger than the sum of its proper divisors (3409330).

4221518 is a wasteful number, since it uses less digits than its factorization.

4221518 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 248.

The product of its digits is 640, while the sum is 23.

The square root of 4221518 is about 2054.6333006160. The cubic root of 4221518 is about 161.6179331388.

The spelling of 4221518 in words is "four million, two hundred twenty-one thousand, five hundred eighteen".