221331222 has 24 divisors (see below), whose sum is σ = 548058576. Its totient is φ = 63237456.

The previous prime is 221331199. The next prime is 221331251. The reversal of 221331222 is 222133122.

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 = 221331195 and 221331204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 878173 + ... + 878424.

It is an arithmetic number, because the mean of its divisors is an integer number (22835774).

Almost surely, 2^221331222 is an apocalyptic number.

221331222 is an abundant number, since it is smaller than the sum of its proper divisors (326727354).

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

221331222 is a wasteful number, since it uses less digits than its factorization.

221331222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756612 (or 1756609 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 221331222 is about 14877.2047777800. The cubic root of 221331222 is about 604.8962525012.

Adding to 221331222 its reverse (222133122), we get a palindrome (443464344).

It can be divided in two parts, 22133122 and 2, that multiplied together give a palindrome (44266244).

The spelling of 221331222 in words is "two hundred twenty-one million, three hundred thirty-one thousand, two hundred twenty-two".