501222220 has 48 divisors (see below), whose sum is σ = 1116672480. Its totient is φ = 188324864.

The previous prime is 501222193. The next prime is 501222259. The reversal of 501222220 is 22222105.

It is a junction number, because it is equal to n+sod(n) for n = 501222194 and 501222203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 222942 + ... + 225178.

It is an arithmetic number, because the mean of its divisors is an integer number (23264010).

Almost surely, 2^501222220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 501222220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (558336240).

501222220 is an abundant number, since it is smaller than the sum of its proper divisors (615450260).

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

501222220 is a wasteful number, since it uses less digits than its factorization.

501222220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2922 (or 2920 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 501222220 is about 22387.9927639795. The cubic root of 501222220 is about 794.3467175155.

Adding to 501222220 its reverse (22222105), we get a palindrome (523444325).

The spelling of 501222220 in words is "five hundred one million, two hundred twenty-two thousand, two hundred twenty".