4221530 has 16 divisors (see below), whose sum is σ = 7861320. Its totient is φ = 1630272.

The previous prime is 4221521. The next prime is 4221533. The reversal of 4221530 is 351224.

It can be written as a sum of positive squares in 4 ways, for example, as 2725801 + 1495729 = 1651^2 + 1223^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4221499 and 4221508.

It is not an unprimeable number, because it can be changed into a prime (4221533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6989 + ... + 7568.

Almost surely, 2^4221530 is an apocalyptic number.

4221530 is a deficient number, since it is larger than the sum of its proper divisors (3639790).

4221530 is a wasteful number, since it uses less digits than its factorization.

4221530 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14593.

The product of its (nonzero) digits is 240, while the sum is 17.

The square root of 4221530 is about 2054.6362208430. The cubic root of 4221530 is about 161.6180862759.

Adding to 4221530 its reverse (351224), we get a palindrome (4572754).

The spelling of 4221530 in words is "four million, two hundred twenty-one thousand, five hundred thirty".