221212321121112 has 128 divisors (see below), whose sum is σ = 557341251033600. Its totient is φ = 73164301636608.

The previous prime is 221212321121101. The next prime is 221212321121119. The reversal of 221212321121112 is 211121123212122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212321121119) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 6464965828 + ... + 6465000044.

It is an arithmetic number, because the mean of its divisors is an integer number (4354228523700).

Almost surely, 2^{221212321121112} is an apocalyptic number.

It is an amenable number.

221212321121112 is an abundant number, since it is smaller than the sum of its proper divisors (336128929912488).

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

221212321121112 is a wasteful number, since it uses less digits than its factorization.

221212321121112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37065 (or 37061 counting only the distinct ones).

The product of its digits is 384, while the sum is 24.

Adding to 221212321121112 its reverse (211121123212122), we get a palindrome (432333444333234).

The spelling of 221212321121112 in words is "two hundred twenty-one trillion, two hundred twelve billion, three hundred twenty-one million, one hundred twenty-one thousand, one hundred twelve".