221010212 has 24 divisors (see below), whose sum is σ = 397789056. Its totient is φ = 107395808.

The previous prime is 221010187. The next prime is 221010241. The reversal of 221010212 is 212010122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221010193 and 221010202.

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, 17813 + ... + 27555.

It is an arithmetic number, because the mean of its divisors is an integer number (16574544).

Almost surely, 2^221010212 is an apocalyptic number.

It is an amenable number.

221010212 is a deficient number, since it is larger than the sum of its proper divisors (176778844).

221010212 is a wasteful number, since it uses less digits than its factorization.

221010212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9907 (or 9905 counting only the distinct ones).

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

The square root of 221010212 is about 14866.4122100795. The cubic root of 221010212 is about 604.6036718524.

Adding to 221010212 its reverse (212010122), we get a palindrome (433020334).

The spelling of 221010212 in words is "two hundred twenty-one million, ten thousand, two hundred twelve".