521440222 has 8 divisors (see below), whose sum is σ = 816167376. Its totient is φ = 249384432.

The previous prime is 521440219. The next prime is 521440247. The reversal of 521440222 is 222044125.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 521440193 and 521440202.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5667783 + ... + 5667874.

It is an arithmetic number, because the mean of its divisors is an integer number (102020922).

Almost surely, 2^521440222 is an apocalyptic number.

521440222 is a deficient number, since it is larger than the sum of its proper divisors (294727154).

521440222 is a wasteful number, since it uses less digits than its factorization.

521440222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11335682.

The product of its (nonzero) digits is 1280, while the sum is 22.

The square root of 521440222 is about 22835.0656228529. The cubic root of 521440222 is about 804.8868696388.

Adding to 521440222 its reverse (222044125), we get a palindrome (743484347).

The spelling of 521440222 in words is "five hundred twenty-one million, four hundred forty thousand, two hundred twenty-two".