111121210220 has 24 divisors (see below), whose sum is σ = 239046117408. Its totient is φ = 43364374400.

The previous prime is 111121210219. The next prime is 111121210223. The reversal of 111121210220 is 22012121111.

It is a junction number, because it is equal to n+sod(n) for n = 111121210195 and 111121210204.

It is not an unprimeable number, because it can be changed into a prime (111121210223) 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 7 ways as a sum of consecutive naturals, for example, 67756016 + ... + 67757655.

It is an arithmetic number, because the mean of its divisors is an integer number (9960254892).

Almost surely, 2^111121210220 is an apocalyptic number.

111121210220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111121210220 is an abundant number, since it is smaller than the sum of its proper divisors (127924907188).

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

111121210220 is a wasteful number, since it uses less digits than its factorization.

111121210220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135513721 (or 135513719 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 111121210220 its reverse (22012121111), we get a palindrome (133133331331).

The spelling of 111121210220 in words is "one hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, two hundred twenty".