4221615 has 16 divisors (see below), whose sum is σ = 6789600. Its totient is φ = 2239872.

The previous prime is 4221583. The next prime is 4221619. The reversal of 4221615 is 5161224.

It is not a de Polignac number, because 4221615 - 2⁵ = 4221583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4221591 and 4221600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2821 + ... + 4049.

It is an arithmetic number, because the mean of its divisors is an integer number (424350).

Almost surely, 2^4221615 is an apocalyptic number.

4221615 is a deficient number, since it is larger than the sum of its proper divisors (2567985).

4221615 is a wasteful number, since it uses less digits than its factorization.

4221615 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1466.

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

The square root of 4221615 is about 2054.6569056658. The cubic root of 4221615 is about 161.6191709889.

Adding to 4221615 its reverse (5161224), we get a palindrome (9382839).

The spelling of 4221615 in words is "four million, two hundred twenty-one thousand, six hundred fifteen".