221012222 has 16 divisors (see below), whose sum is σ = 341503344.
Its totient is φ = 107208000.
The previous prime is 221012201. The next prime is 221012227. The reversal of 221012222 is 222210122.
It is a junction number, because it is equal to n+sod(n) for n = 221012197 and 221012206.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (221012227) by changing a digit.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7397 + ... + 22287.
It is an arithmetic number, because the mean of its divisors is an integer number (21343959).
Almost surely, 2221012222 is an apocalyptic number.
221012222 is a deficient number, since it is larger than the sum of its proper divisors (120491122).
221012222 is a wasteful number, since it uses less digits than its factorization.
221012222 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 15115.
The product of its (nonzero) digits is 64, while the sum is 14.
The square root of 221012222 is about 14866.4798119797.
The cubic root of 221012222 is about 604.6055047235.
Adding to 221012222 its reverse (222210122), we get a palindrome (443222344).
It can be divided in two parts, 2210122 and 22, that multiplied together give a palindrome (48622684).
The spelling of 221012222 in words is "two hundred twenty-one million, twelve thousand, two hundred twenty-two".