111120210021 has 4 divisors (see below), whose sum is σ = 148160280032. Its totient is φ = 74080140012.

The previous prime is 111120210001. The next prime is 111120210029. The reversal of 111120210021 is 120012021111.

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 111120210021 - 2²¹ = 111118112869 is a prime.

It is a super-2 number, since 2×111120210021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111120209979 and 111120210006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111120210029) 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, 18520035001 + ... + 18520035006.

It is an arithmetic number, because the mean of its divisors is an integer number (37040070008).

Almost surely, 2^111120210021 is an apocalyptic number.

It is an amenable number.

111120210021 is a deficient number, since it is larger than the sum of its proper divisors (37040070011).

111120210021 is an equidigital number, since it uses as much as digits as its factorization.

111120210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37040070010.

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

Adding to 111120210021 its reverse (120012021111), we get a palindrome (231132231132).

The spelling of 111120210021 in words is "one hundred eleven billion, one hundred twenty million, two hundred ten thousand, twenty-one".