111111022221120 has 84 divisors (see below), whose sum is σ = 382175620191300. Its totient is φ = 29629605924864.

The previous prime is 111111022221113. The next prime is 111111022221137. The reversal of 111111022221120 is 21122220111111.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 48438593326656 + 62672428894464 = 6959784^2 + 7916592^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 111111022221093 and 111111022221102.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 19290105145 + ... + 19290110904.

Almost surely, 2^{111111022221120} is an apocalyptic number.

111111022221120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111111022221120 is an abundant number, since it is smaller than the sum of its proper divisors (271064597970180).

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

111111022221120 is a wasteful number, since it uses less digits than its factorization.

111111022221120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38580216072 (or 38580216059 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 111111022221120 its reverse (21122220111111), we get a palindrome (132233242332231).

The spelling of 111111022221120 in words is "one hundred eleven trillion, one hundred eleven billion, twenty-two million, two hundred twenty-one thousand, one hundred twenty".