111111122021020 has 192 divisors, whose sum is σ = 282360553896960. Its totient is φ = 36250765056000.

The previous prime is 111111122020937. The next prime is 111111122021023. The reversal of 111111122021020 is 20120221111111.

It is a junction number, because it is equal to n+sod(n) for n = 111111122020985 and 111111122021003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111122021023) 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 63 ways as a sum of consecutive naturals, for example, 3988744 + ... + 15431536.

It is an arithmetic number, because the mean of its divisors is an integer number (1470627884880).

Almost surely, 2^{111111122021020} is an apocalyptic number.

111111122021020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 111111122021020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141180276948480).

111111122021020 is an abundant number, since it is smaller than the sum of its proper divisors (171249431875940).

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

111111122021020 is a wasteful number, since it uses less digits than its factorization.

111111122021020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11442956 (or 11442954 counting only the distinct ones).

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

Adding to 111111122021020 its reverse (20120221111111), we get a palindrome (131231343132131).

Subtracting from 111111122021020 its reverse (20120221111111), we obtain a palindrome (90990900909909).

The spelling of 111111122021020 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twenty-two million, twenty-one thousand, twenty".