221331210212 has 12 divisors (see below), whose sum is σ = 442662420480. Its totient is φ = 94856232936.

The previous prime is 221331210209. The next prime is 221331210283. The reversal of 221331210212 is 212012133122.

221331210212 is an admirable number.

It is a super-2 number, since 2×221331210212² (a number of 23 digits) contains 22 as substring.

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, 3952343012 + ... + 3952343067.

It is an arithmetic number, because the mean of its divisors is an integer number (36888535040).

Almost surely, 2^221331210212 is an apocalyptic number.

It is an amenable number.

221331210212 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

221331210212 is a wasteful number, since it uses less digits than its factorization.

221331210212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7904686090 (or 7904686088 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 221331210212 its reverse (212012133122), we get a palindrome (433343343334).

The spelling of 221331210212 in words is "two hundred twenty-one billion, three hundred thirty-one million, two hundred ten thousand, two hundred twelve".