221302212 has 12 divisors (see below), whose sum is σ = 516371856. Its totient is φ = 73767400.

The previous prime is 221302187. The next prime is 221302223. The reversal of 221302212 is 212203122.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 221302191 and 221302200.

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, 9220914 + ... + 9220937.

It is an arithmetic number, because the mean of its divisors is an integer number (43030988).

Almost surely, 2^221302212 is an apocalyptic number.

It is an amenable number.

221302212 is an abundant number, since it is smaller than the sum of its proper divisors (295069644).

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

221302212 is a wasteful number, since it uses less digits than its factorization.

221302212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18441858 (or 18441856 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 221302212 is about 14876.2297642918. The cubic root of 221302212 is about 604.8698233229.

Adding to 221302212 its reverse (212203122), we get a palindrome (433505334).

It can be divided in two parts, 22130 and 2212, that added together give a palindrome (24342).

The spelling of 221302212 in words is "two hundred twenty-one million, three hundred two thousand, two hundred twelve".