221222212112 has 20 divisors (see below), whose sum is σ = 467583312336. Its totient is φ = 100555550880.

The previous prime is 221222212037. The next prime is 221222212129. The reversal of 221222212112 is 211212222122.

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

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, 628472018 + ... + 628472369.

Almost surely, 2^221222212112 is an apocalyptic number.

221222212112 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221222212112 is an abundant number, since it is smaller than the sum of its proper divisors (246361100224).

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

221222212112 is a wasteful number, since it uses less digits than its factorization.

221222212112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1256944406 (or 1256944400 counting only the distinct ones).

The product of its digits is 256, while the sum is 20.

Adding to 221222212112 its reverse (211212222122), we get a palindrome (432434434234).

It can be divided in two parts, 221222 and 212112, that added together give a palindrome (433334).

The spelling of 221222212112 in words is "two hundred twenty-one billion, two hundred twenty-two million, two hundred twelve thousand, one hundred twelve".