111221211220212 has 48 divisors (see below), whose sum is σ = 261598849162560. Its totient is φ = 36777392994048.

The previous prime is 111221211220169. The next prime is 111221211220219. The reversal of 111221211220212 is 212022112122111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111221211220219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 73185958 + ... + 74690205.

It is an arithmetic number, because the mean of its divisors is an integer number (5449976024220).

Almost surely, 2^{111221211220212} is an apocalyptic number.

111221211220212 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

111221211220212 is an abundant number, since it is smaller than the sum of its proper divisors (150377637942348).

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

111221211220212 is a wasteful number, since it uses less digits than its factorization.

111221211220212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147876672 (or 147876670 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 21.

Adding to 111221211220212 its reverse (212022112122111), we get a palindrome (323243323342323).

The spelling of 111221211220212 in words is "one hundred eleven trillion, two hundred twenty-one billion, two hundred eleven million, two hundred twenty thousand, two hundred twelve".