221222221224 has 64 divisors (see below), whose sum is σ = 587589379200. Its totient is φ = 69273679104.

The previous prime is 221222221177. The next prime is 221222221289. The reversal of 221222221224 is 422122222122.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 221222221194 and 221222221203.

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, 4269492 + ... + 4320995.

It is an arithmetic number, because the mean of its divisors is an integer number (9181084050).

Almost surely, 2^221222221224 is an apocalyptic number.

221222221224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

221222221224 is an abundant number, since it is smaller than the sum of its proper divisors (366367157976).

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

221222221224 is a wasteful number, since it uses less digits than its factorization.

221222221224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8590562 (or 8590558 counting only the distinct ones).

The product of its digits is 2048, while the sum is 24.

Adding to 221222221224 its reverse (422122222122), we get a palindrome (643344443346).

It can be divided in two parts, 22122222122 and 4, that multiplied together give a palindrome (88488888488).

The spelling of 221222221224 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twenty-four".