111011212111220 has 24 divisors (see below), whose sum is σ = 246836695165704. Its totient is φ = 41792456324096.

The previous prime is 111011212111139. The next prime is 111011212111229. The reversal of 111011212111220 is 22111212110111.

It can be written as a sum of positive squares in 4 ways, for example, as 16607874476176 + 94403337635044 = 4075276^2 + 9716138^2 .

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111011212111229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163251782177 + ... + 163251782856.

It is an arithmetic number, because the mean of its divisors is an integer number (10284862298571).

Almost surely, 2^{111011212111220} is an apocalyptic number.

111011212111220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111011212111220 is an abundant number, since it is smaller than the sum of its proper divisors (135825483054484).

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

111011212111220 is a wasteful number, since it uses less digits than its factorization.

111011212111220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326503565059 (or 326503565057 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 111011212111220 its reverse (22111212110111), we get a palindrome (133122424221331).

The spelling of 111011212111220 in words is "one hundred eleven trillion, eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred twenty".