221303212 has 24 divisors (see below), whose sum is σ = 441606816. Its totient is φ = 96131328.

The previous prime is 221303209. The next prime is 221303227. The reversal of 221303212 is 212303122.

221303212 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×221303212² = 97950223283033888, which contains 22 as substring.

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 7 ways as a sum of consecutive naturals, for example, 124288 + ... + 126055.

It is an arithmetic number, because the mean of its divisors is an integer number (18400284).

Almost surely, 2^221303212 is an apocalyptic number.

It is an amenable number.

221303212 is a deficient number, since it is larger than the sum of its proper divisors (220303604).

221303212 is a wasteful number, since it uses less digits than its factorization.

221303212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250377 (or 250375 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 221303212 is about 14876.2633749205. The cubic root of 221303212 is about 604.8707343981.

Adding to 221303212 its reverse (212303122), we get a palindrome (433606334).

The spelling of 221303212 in words is "two hundred twenty-one million, three hundred three thousand, two hundred twelve".