221111212 has 12 divisors (see below), whose sum is σ = 442222480. Its totient is φ = 94761936.

The previous prime is 221111183. The next prime is 221111249. The reversal of 221111212 is 212111122.

221111212 is an admirable number.

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

It is a junction number, because it is equal to n+sod(n) for n = 221111192 and 221111201.

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, 3948387 + ... + 3948442.

Almost surely, 2^221111212 is an apocalyptic number.

It is an amenable number.

221111212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221111212 is a wasteful number, since it uses less digits than its factorization.

221111212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7896840 (or 7896838 counting only the distinct ones).

The product of its digits is 16, while the sum is 13.

The square root of 221111212 is about 14869.8087412044. The cubic root of 221111212 is about 604.6957575990.

Adding to 221111212 its reverse (212111122), we get a palindrome (433222334).

The spelling of 221111212 in words is "two hundred twenty-one million, one hundred eleven thousand, two hundred twelve".