111111112001021 has 32 divisors (see below), whose sum is σ = 125966928529152. Its totient is φ = 97954838520000.

The previous prime is 111111112001017. The next prime is 111111112001051. The reversal of 111111112001021 is 120100211111111.

It is not a de Polignac number, because 111111112001021 - 2² = 111111112001017 is a prime.

It is a super-4 number, since 4×111111112001021⁴ (a number of 57 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 111111112000987 and 111111112001005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111112001051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3872870 + ... + 15401991.

It is an arithmetic number, because the mean of its divisors is an integer number (3936466516536).

Almost surely, 2^{111111112001021} is an apocalyptic number.

111111112001021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

111111112001021 is a deficient number, since it is larger than the sum of its proper divisors (14855816528131).

111111112001021 is an equidigital number, since it uses as much as digits as its factorization.

111111112001021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19275026 (or 19275004 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 14.

Adding to 111111112001021 its reverse (120100211111111), we get a palindrome (231211323112132).

The spelling of 111111112001021 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred twelve million, one thousand, twenty-one".