111021212121020 has 96 divisors (see below), whose sum is σ = 250053096384000. Its totient is φ = 41276193663744.

The previous prime is 111021212120953. The next prime is 111021212121023. The reversal of 111021212121020 is 20121212120111.

It is a self number, because there is not a number n which added to its sum of digits gives 111021212121020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021212121023) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 992987081 + ... + 993098879.

It is an arithmetic number, because the mean of its divisors is an integer number (2604719754000).

Almost surely, 2^{111021212121020} is an apocalyptic number.

111021212121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111021212121020 is an abundant number, since it is smaller than the sum of its proper divisors (139031884262980).

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

111021212121020 is a wasteful number, since it uses less digits than its factorization.

111021212121020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161187 (or 161185 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 111021212121020 its reverse (20121212120111), we get a palindrome (131142424241131).

Subtracting from 111021212121020 its reverse (20121212120111), we obtain a palindrome (90900000000909).

The spelling of 111021212121020 in words is "one hundred eleven trillion, twenty-one billion, two hundred twelve million, one hundred twenty-one thousand, twenty".