221111222212 has 12 divisors (see below), whose sum is σ = 407310146320. Its totient is φ = 104736894696.

The previous prime is 221111222179. The next prime is 221111222309. The reversal of 221111222212 is 212222111122.

It is a Harshad number since it is a multiple of its sum of digits (19).

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

It is a self number, because there is not a number n which added to its sum of digits gives 221111222212.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1454679018 + ... + 1454679169.

Almost surely, 2^221111222212 is an apocalyptic number.

It is an amenable number.

221111222212 is a deficient number, since it is larger than the sum of its proper divisors (186198924108).

221111222212 is a wasteful number, since it uses less digits than its factorization.

221111222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2909358210 (or 2909358208 counting only the distinct ones).

The product of its digits is 128, while the sum is 19.

Adding to 221111222212 its reverse (212222111122), we get a palindrome (433333333334).

The spelling of 221111222212 in words is "two hundred twenty-one billion, one hundred eleven million, two hundred twenty-two thousand, two hundred twelve".