221223222 has 48 divisors (see below), whose sum is σ = 537041232. Its totient is φ = 65223360.

The previous prime is 221223221. The next prime is 221223241. The reversal of 221223222 is 222322122.

221223222 is a `hidden beast` number, since 221 + 223 + 222 = 666.

It is a super-2 number, since 2×221223222² = 97879427904122568, which contains 22 as substring.

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

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 = 221223195 and 221223204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221223221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7773 + ... + 22424.

It is an arithmetic number, because the mean of its divisors is an integer number (11188359).

Almost surely, 2^221223222 is an apocalyptic number.

221223222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

221223222 is an abundant number, since it is smaller than the sum of its proper divisors (315818010).

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

221223222 is a wasteful number, since it uses less digits than its factorization.

221223222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30253 (or 30250 counting only the distinct ones).

The product of its digits is 384, while the sum is 18.

The square root of 221223222 is about 14873.5746207830. The cubic root of 221223222 is about 604.7978488155.

Adding to 221223222 its reverse (222322122), we get a palindrome (443545344).

It can be divided in two parts, 221223 and 222, that added together give a triangular number (221445 = T₆₆₅).

The spelling of 221223222 in words is "two hundred twenty-one million, two hundred twenty-three thousand, two hundred twenty-two".