221012212 has 12 divisors (see below), whose sum is σ = 388797696. Its totient is φ = 109927160.

The previous prime is 221012201. The next prime is 221012227. The reversal of 221012212 is 212210122.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 221012192 and 221012201.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143878 + ... + 145405.

It is an arithmetic number, because the mean of its divisors is an integer number (32399808).

Almost surely, 2^221012212 is an apocalyptic number.

It is an amenable number.

221012212 is a deficient number, since it is larger than the sum of its proper divisors (167785484).

221012212 is a wasteful number, since it uses less digits than its factorization.

221012212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289478 (or 289476 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 221012212 is about 14866.4794756526. The cubic root of 221012212 is about 604.6054956048.

Adding to 221012212 its reverse (212210122), we get a palindrome (433222334).

The spelling of 221012212 in words is "two hundred twenty-one million, twelve thousand, two hundred twelve".