221112212 has 12 divisors (see below), whose sum is σ = 399428736. Its totient is φ = 106989720.

The previous prime is 221112191. The next prime is 221112239. The reversal of 221112212 is 212211122.

It is a super-2 number, since 2×221112212² = 97781220591065888, which contains 22 as substring.

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

It is a congruent number.

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, 891458 + ... + 891705.

It is an arithmetic number, because the mean of its divisors is an integer number (33285728).

Almost surely, 2^221112212 is an apocalyptic number.

It is an amenable number.

221112212 is a deficient number, since it is larger than the sum of its proper divisors (178316524).

221112212 is a wasteful number, since it uses less digits than its factorization.

221112212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1783198 (or 1783196 counting only the distinct ones).

The product of its digits is 32, while the sum is 14.

The square root of 221112212 is about 14869.8423663467. The cubic root of 221112212 is about 604.6966691989.

Adding to 221112212 its reverse (212211122), we get a palindrome (433323334).

The spelling of 221112212 in words is "two hundred twenty-one million, one hundred twelve thousand, two hundred twelve".