221213112 has 32 divisors (see below), whose sum is σ = 585565200. Its totient is φ = 69400064.

The previous prime is 221213099. The next prime is 221213123. The reversal of 221213112 is 211312122.

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 = 221213091 and 221213100.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270687 + ... + 271502.

Almost surely, 2^221213112 is an apocalyptic number.

It is an amenable number.

221213112 is an abundant number, since it is smaller than the sum of its proper divisors (364352088).

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

221213112 is a wasteful number, since it uses less digits than its factorization.

221213112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542215 (or 542211 counting only the distinct ones).

The product of its digits is 48, while the sum is 15.

The square root of 221213112 is about 14873.2347524000. The cubic root of 221213112 is about 604.7886354979.

Adding to 221213112 its reverse (211312122), we get a palindrome (432525234).

The spelling of 221213112 in words is "two hundred twenty-one million, two hundred thirteen thousand, one hundred twelve".