221222122220 has 48 divisors (see below), whose sum is σ = 528834555648. Its totient is φ = 76946823360.

The previous prime is 221222122213. The next prime is 221222122237. The reversal of 221222122220 is 22221222122.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 221222122192 and 221222122201.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21854834 + ... + 21864953.

It is an arithmetic number, because the mean of its divisors is an integer number (11017386576).

Almost surely, 2^221222122220 is an apocalyptic number.

221222122220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221222122220 is an abundant number, since it is smaller than the sum of its proper divisors (307612433428).

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

221222122220 is a wasteful number, since it uses less digits than its factorization.

221222122220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43719830 (or 43719828 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 221222122220 its reverse (22221222122), we get a palindrome (243443344342).

The spelling of 221222122220 in words is "two hundred twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, two hundred twenty".