221222222222 has 4 divisors (see below), whose sum is σ = 331833333336. Its totient is φ = 110611111110.

The previous prime is 221222222209. The next prime is 221222222233. The reversal of 221222222222 is 222222222122.

It is a semiprime because it is the product of two primes.

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

221222222222 is a modest number, since divided by 222222 gives 221222 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55305555554 + ... + 55305555557.

It is an arithmetic number, because the mean of its divisors is an integer number (82958333334).

Almost surely, 2^221222222222 is an apocalyptic number.

221222222222 is a deficient number, since it is larger than the sum of its proper divisors (110611111114).

221222222222 is a wasteful number, since it uses less digits than its factorization.

221222222222 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110611111113.

The product of its digits is 2048, while the sum is 23.

Adding to 221222222222 its reverse (222222222122), we get a palindrome (443444444344).

The spelling of 221222222222 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twenty-two thousand, two hundred twenty-two".