221912881212 has 24 divisors (see below), whose sum is σ = 564869152512. Its totient is φ = 67246327600.

The previous prime is 221912881199. The next prime is 221912881219. The reversal of 221912881212 is 212188219122.

221912881212 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×221912881212³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221912881219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840578964 + ... + 840579227.

It is an arithmetic number, because the mean of its divisors is an integer number (23536214688).

Almost surely, 2^221912881212 is an apocalyptic number.

221912881212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

221912881212 is an abundant number, since it is smaller than the sum of its proper divisors (342956271300).

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

221912881212 is a wasteful number, since it uses less digits than its factorization.

221912881212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1681158209 (or 1681158207 counting only the distinct ones).

The product of its digits is 18432, while the sum is 39.

The spelling of 221912881212 in words is "two hundred twenty-one billion, nine hundred twelve million, eight hundred eighty-one thousand, two hundred twelve".