111122111121021 has 256 divisors, whose sum is σ = 225583626240000. Its totient is φ = 52192262753280.

The previous prime is 111122111121017. The next prime is 111122111121023. The reversal of 111122111121021 is 120121111221111.

It is not a de Polignac number, because 111122111121021 - 2² = 111122111121017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111122111120985 and 111122111121003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111122111121023) by changing a digit.

It is a polite number, since it can be written in 255 ways as a sum of consecutive naturals, for example, 857961415 + ... + 858090923.

It is an arithmetic number, because the mean of its divisors is an integer number (881186040000).

Almost surely, 2^{111122111121021} is an apocalyptic number.

111122111121021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111122111121021 is an abundant number, since it is smaller than the sum of its proper divisors (114461515118979).

111122111121021 is a wasteful number, since it uses less digits than its factorization.

111122111121021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130201 (or 130195 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 18.

Adding to 111122111121021 its reverse (120121111221111), we get a palindrome (231243222342132).

The spelling of 111122111121021 in words is "one hundred eleven trillion, one hundred twenty-two billion, one hundred eleven million, one hundred twenty-one thousand, twenty-one".