111021120021 has 32 divisors (see below), whose sum is σ = 172188979200. Its totient is φ = 62313324480.

The previous prime is 111021120011. The next prime is 111021120061. The reversal of 111021120021 is 120021120111.

It is not a de Polignac number, because 111021120021 - 2¹⁰ = 111021118997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111021119979 and 111021120006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111021120011) 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, 860770 + ... + 981308.

It is an arithmetic number, because the mean of its divisors is an integer number (5380905600).

Almost surely, 2^111021120021 is an apocalyptic number.

It is an amenable number.

111021120021 is a deficient number, since it is larger than the sum of its proper divisors (61167859179).

111021120021 is a wasteful number, since it uses less digits than its factorization.

111021120021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121329.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 111021120021 its reverse (120021120111), we get a palindrome (231042240132).

The spelling of 111021120021 in words is "one hundred eleven billion, twenty-one million, one hundred twenty thousand, twenty-one".