221021222 has 16 divisors (see below), whose sum is σ = 333655200. Its totient is φ = 109805760.

The previous prime is 221021221. The next prime is 221021249. The reversal of 221021222 is 222120122.

It is a junction number, because it is equal to n+sod(n) for n = 221021197 and 221021206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221021221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 388154 + ... + 388722.

It is an arithmetic number, because the mean of its divisors is an integer number (20853450).

Almost surely, 2^221021222 is an apocalyptic number.

221021222 is a deficient number, since it is larger than the sum of its proper divisors (112633978).

221021222 is a wasteful number, since it uses less digits than its factorization.

221021222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1471.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 221021222 is about 14866.7825032856. The cubic root of 221021222 is about 604.6137114728.

Adding to 221021222 its reverse (222120122), we get a palindrome (443141344).

It can be divided in two parts, 2210 and 21222, that added together give a palindrome (23432).

The spelling of 221021222 in words is "two hundred twenty-one million, twenty-one thousand, two hundred twenty-two".