521556222 has 48 divisors (see below), whose sum is σ = 1165456656. Its totient is φ = 155443200.

The previous prime is 521556221. The next prime is 521556229. The reversal of 521556222 is 222655125.

It is a self number, because there is not a number n which added to its sum of digits gives 521556222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (521556221) 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 23 ways as a sum of consecutive naturals, for example, 38398 + ... + 50174.

It is an arithmetic number, because the mean of its divisors is an integer number (24280347).

Almost surely, 2^521556222 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 521556222, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (582728328).

521556222 is an abundant number, since it is smaller than the sum of its proper divisors (643900434).

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

521556222 is a wasteful number, since it uses less digits than its factorization.

521556222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11865 (or 11854 counting only the distinct ones).

The product of its digits is 12000, while the sum is 30.

The square root of 521556222 is about 22837.6054348962. The cubic root of 521556222 is about 804.9465504679.

The spelling of 521556222 in words is "five hundred twenty-one million, five hundred fifty-six thousand, two hundred twenty-two".