221100212 has 12 divisors (see below), whose sum is σ = 390682656. Its totient is φ = 109476600.

The previous prime is 221100203. The next prime is 221100227. The reversal of 221100212 is 212001122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221100193 and 221100202.

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, 267914 + ... + 268737.

It is an arithmetic number, because the mean of its divisors is an integer number (32556888).

Almost surely, 2^221100212 is an apocalyptic number.

It is an amenable number.

221100212 is a deficient number, since it is larger than the sum of its proper divisors (169582444).

221100212 is a wasteful number, since it uses less digits than its factorization.

221100212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 536758 (or 536756 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 221100212 is about 14869.4388596208. The cubic root of 221100212 is about 604.6857298192.

Adding to 221100212 its reverse (212001122), we get a palindrome (433101334).

The spelling of 221100212 in words is "two hundred twenty-one million, one hundred thousand, two hundred twelve".