111120111021 has 4 divisors (see below), whose sum is σ = 148160148032. Its totient is φ = 74080074012.

The previous prime is 111120110971. The next prime is 111120111049. The reversal of 111120111021 is 120111021111.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 111120111021 - 2³⁰ = 110046369197 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111120110988 and 111120111006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120111121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18520018501 + ... + 18520018506.

It is an arithmetic number, because the mean of its divisors is an integer number (37040037008).

Almost surely, 2^111120111021 is an apocalyptic number.

It is an amenable number.

111120111021 is a deficient number, since it is larger than the sum of its proper divisors (37040037011).

111120111021 is an equidigital number, since it uses as much as digits as its factorization.

111120111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37040037010.

The product of its (nonzero) digits is 4, while the sum is 12.

Adding to 111120111021 its reverse (120111021111), we get a palindrome (231231132132).

It can be divided in two parts, 111 and 120111021, that multiplied together give a palindrome (13332323331).

The spelling of 111120111021 in words is "one hundred eleven billion, one hundred twenty million, one hundred eleven thousand, twenty-one".