4221523 has 4 divisors (see below), whose sum is σ = 4275040. Its totient is φ = 4168008.

The previous prime is 4221521. The next prime is 4221533. The reversal of 4221523 is 3251224.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4221523 - 2¹ = 4221521 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 4221523.

It is not an unprimeable number, because it can be changed into a prime (4221521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26640 + ... + 26797.

It is an arithmetic number, because the mean of its divisors is an integer number (1068760).

Almost surely, 2^4221523 is an apocalyptic number.

4221523 is a deficient number, since it is larger than the sum of its proper divisors (53517).

4221523 is an equidigital number, since it uses as much as digits as its factorization.

4221523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53516.

The product of its digits is 480, while the sum is 19.

The square root of 4221523 is about 2054.6345173777. The cubic root of 4221523 is about 161.6179969459.

Adding to 4221523 its reverse (3251224), we get a palindrome (7472747).

Subtracting from 4221523 its reverse (3251224), we obtain a cube (970299 = 99³).

The spelling of 4221523 in words is "four million, two hundred twenty-one thousand, five hundred twenty-three".