521222112 has 36 divisors (see below), whose sum is σ = 1482226200. Its totient is φ = 173740608.

The previous prime is 521222111. The next prime is 521222129. The reversal of 521222112 is 211222125.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521222111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 904612 + ... + 905187.

It is an arithmetic number, because the mean of its divisors is an integer number (41172950).

Almost surely, 2^521222112 is an apocalyptic number.

It is an amenable number.

521222112 is an abundant number, since it is smaller than the sum of its proper divisors (961004088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

521222112 is a wasteful number, since it uses less digits than its factorization.

521222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1809815 (or 1809804 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 521222112 is about 22830.2893542767. The cubic root of 521222112 is about 804.7746302740.

Adding to 521222112 its reverse (211222125), we get a palindrome (732444237).

The spelling of 521222112 in words is "five hundred twenty-one million, two hundred twenty-two thousand, one hundred twelve".