111023012021 has 4 divisors (see below), whose sum is σ = 117553777452. Its totient is φ = 104492246592.

The previous prime is 111023011937. The next prime is 111023012041. The reversal of 111023012021 is 120210320111.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 32391000625 + 78632011396 = 179975^2 + 280414^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-111023012021 is a prime.

It is a super-2 number, since 2×111023012021² (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 = 111023011987 and 111023012005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111023012041) 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, 3265382690 + ... + 3265382723.

It is an arithmetic number, because the mean of its divisors is an integer number (29388444363).

Almost surely, 2^111023012021 is an apocalyptic number.

It is an amenable number.

111023012021 is a deficient number, since it is larger than the sum of its proper divisors (6530765431).

111023012021 is an equidigital number, since it uses as much as digits as its factorization.

111023012021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6530765430.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 111023012021 its reverse (120210320111), we get a palindrome (231233332132).

The spelling of 111023012021 in words is "one hundred eleven billion, twenty-three million, twelve thousand, twenty-one".