111121202220021 has 64 divisors (see below), whose sum is σ = 192436521062400. Its totient is φ = 62060775887808.

The previous prime is 111121202220001. The next prime is 111121202220043. The reversal of 111121202220021 is 120022202121111.

It is not a de Polignac number, because 111121202220021 - 2⁷ = 111121202219893 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111121202219976 and 111121202220003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111121202220001) 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, 26871841 + ... + 30730086.

It is an arithmetic number, because the mean of its divisors is an integer number (3006820641600).

Almost surely, 2^{111121202220021} is an apocalyptic number.

It is an amenable number.

111121202220021 is a deficient number, since it is larger than the sum of its proper divisors (81315318842379).

111121202220021 is a wasteful number, since it uses less digits than its factorization.

111121202220021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57602175 (or 57602169 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 111121202220021 its reverse (120022202121111), we get a palindrome (231143404341132).

The spelling of 111121202220021 in words is "one hundred eleven trillion, one hundred twenty-one billion, two hundred two million, two hundred twenty thousand, twenty-one".