221221000312 has 16 divisors (see below), whose sum is σ = 446696250840. Its totient is φ = 102102000096.

The previous prime is 221221000283. The next prime is 221221000373. The reversal of 221221000312 is 213000122122.

It is a happy number.

It is a super-3 number, since 3×221221000312³ (a number of 35 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1063562398 + ... + 1063562605.

Almost surely, 2^221221000312 is an apocalyptic number.

It is an amenable number.

221221000312 is an abundant number, since it is smaller than the sum of its proper divisors (225475250528).

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

221221000312 is a wasteful number, since it uses less digits than its factorization.

221221000312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127125022 (or 2127125018 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 221221000312 its reverse (213000122122), we get a palindrome (434221122434).

The spelling of 221221000312 in words is "two hundred twenty-one billion, two hundred twenty-one million, three hundred twelve", and thus it is an aban number.