521442111 has 16 divisors (see below), whose sum is σ = 710797824. Its totient is φ = 339873024.

The previous prime is 521442083. The next prime is 521442113. The reversal of 521442111 is 111244125.

It is not a de Polignac number, because 521442111 - 2¹¹ = 521440063 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521442113) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 228271 + ... + 230543.

It is an arithmetic number, because the mean of its divisors is an integer number (44424864).

Almost surely, 2^521442111 is an apocalyptic number.

521442111 is a deficient number, since it is larger than the sum of its proper divisors (189355713).

521442111 is a wasteful number, since it uses less digits than its factorization.

521442111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3950.

The product of its digits is 320, while the sum is 21.

The square root of 521442111 is about 22835.1069846410. The cubic root of 521442111 is about 804.8878415812.

Adding to 521442111 its reverse (111244125), we get a palindrome (632686236).

The spelling of 521442111 in words is "five hundred twenty-one million, four hundred forty-two thousand, one hundred eleven".