4221524 has 12 divisors (see below), whose sum is σ = 7568148. Its totient is φ = 2059200.

The previous prime is 4221521. The next prime is 4221533. The reversal of 4221524 is 4251224.

It is a happy number.

4221524 is nontrivially palindromic in base 6.

It can be written as a sum of positive squares in 2 ways, for example, as 1392400 + 2829124 = 1180^2 + 1682^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4221496 and 4221505.

It is a congruent number.

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, 12707 + ... + 13034.

It is an arithmetic number, because the mean of its divisors is an integer number (630679).

Almost surely, 2^4221524 is an apocalyptic number.

It is an amenable number.

4221524 is a deficient number, since it is larger than the sum of its proper divisors (3346624).

4221524 is a wasteful number, since it uses less digits than its factorization.

4221524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25786 (or 25784 counting only the distinct ones).

The product of its digits is 640, while the sum is 20.

The square root of 4221524 is about 2054.6347607300. The cubic root of 4221524 is about 161.6180097073.

Adding to 4221524 its reverse (4251224), we get a palindrome (8472748).

The spelling of 4221524 in words is "four million, two hundred twenty-one thousand, five hundred twenty-four".