221112212120 has 64 divisors (see below), whose sum is σ = 523727363520. Its totient is φ = 83850747904.

The previous prime is 221112212117. The next prime is 221112212129. The reversal of 221112212120 is 21212211122.

221112212120 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-2 number, since 2×221112212120² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221112212129) 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 15 ways as a sum of consecutive naturals, for example, 959489 + ... + 1167408.

It is an arithmetic number, because the mean of its divisors is an integer number (8183240055).

Almost surely, 2^221112212120 is an apocalyptic number.

221112212120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

221112212120 is an abundant number, since it is smaller than the sum of its proper divisors (302615151400).

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

221112212120 is a wasteful number, since it uses less digits than its factorization.

221112212120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2127044 (or 2127040 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 221112212120 its reverse (21212211122), we get a palindrome (242324423242).

The spelling of 221112212120 in words is "two hundred twenty-one billion, one hundred twelve million, two hundred twelve thousand, one hundred twenty".