111011111111021 has 8 divisors (see below), whose sum is σ = 123155624037600. Its totient is φ = 99208697140240.

The previous prime is 111011111110997. The next prime is 111011111111027. The reversal of 111011111111021 is 120111111110111.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-111011111111021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 111011111110987 and 111011111111005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111011111111027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85524738266 + ... + 85524739563.

It is an arithmetic number, because the mean of its divisors is an integer number (15394453004700).

Almost surely, 2^{111011111111021} is an apocalyptic number.

111011111111021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111011111111021 is a deficient number, since it is larger than the sum of its proper divisors (12144512926579).

111011111111021 is a wasteful number, since it uses less digits than its factorization.

111011111111021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171049477899.

The product of its (nonzero) digits is 2, while the sum is 14.

Adding to 111011111111021 its reverse (120111111110111), we get a palindrome (231122222221132).

The spelling of 111011111111021 in words is "one hundred eleven trillion, eleven billion, one hundred eleven million, one hundred eleven thousand, twenty-one".