4221915 has 16 divisors (see below), whose sum is σ = 6804000. Its totient is φ = 2235392.

The previous prime is 4221913. The next prime is 4221923. The reversal of 4221915 is 5191224.

4221915 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 4221915 - 2¹ = 4221913 is a prime.

4221915 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (4221911) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1291 + ... + 3179.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^4221915 is an apocalyptic number.

4221915 is a deficient number, since it is larger than the sum of its proper divisors (2582085).

4221915 is a wasteful number, since it uses less digits than its factorization.

4221915 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2046.

The product of its digits is 720, while the sum is 24.

The square root of 4221915 is about 2054.7299092581. The cubic root of 4221915 is about 161.6229992712.

The spelling of 4221915 in words is "four million, two hundred twenty-one thousand, nine hundred fifteen".