524213221 has 12 divisors (see below), whose sum is σ = 610500780. Its totient is φ = 448808640.

The previous prime is 524213197. The next prime is 524213233. The reversal of 524213221 is 122312425.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 313644100 + 210569121 = 17710^2 + 14511^2 .

It is not a de Polignac number, because 524213221 - 2⁵ = 524213189 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 524213192 and 524213201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (524213821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40425 + ... + 51793.

It is an arithmetic number, because the mean of its divisors is an integer number (50875065).

Almost surely, 2^524213221 is an apocalyptic number.

It is an amenable number.

524213221 is a deficient number, since it is larger than the sum of its proper divisors (86287559).

524213221 is a wasteful number, since it uses less digits than its factorization.

524213221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12324 (or 12317 counting only the distinct ones).

The product of its digits is 960, while the sum is 22.

The square root of 524213221 is about 22895.7031121562. The cubic root of 524213221 is about 806.3111336694.

Adding to 524213221 its reverse (122312425), we get a palindrome (646525646).

The spelling of 524213221 in words is "five hundred twenty-four million, two hundred thirteen thousand, two hundred twenty-one".