111222122121020 has 24 divisors (see below), whose sum is σ = 241620472195200. Its totient is φ = 42954750612032.

The previous prime is 111222122120987. The next prime is 111222122121029. The reversal of 111222122121020 is 20121221222111.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 111222122120983 and 111222122121001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111222122121029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 95881139180 + ... + 95881140339.

It is an arithmetic number, because the mean of its divisors is an integer number (10067519674800).

Almost surely, 2^{111222122121020} is an apocalyptic number.

111222122121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

111222122121020 is an abundant number, since it is smaller than the sum of its proper divisors (130398350074180).

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

111222122121020 is a wasteful number, since it uses less digits than its factorization.

111222122121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191762279557 (or 191762279555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 111222122121020 its reverse (20121221222111), we get a palindrome (131343343343131).

The spelling of 111222122121020 in words is "one hundred eleven trillion, two hundred twenty-two billion, one hundred twenty-two million, one hundred twenty-one thousand, twenty".