111111102100021 has 8 divisors (see below), whose sum is σ = 111365597145600. Its totient is φ = 110856837058032.

The previous prime is 111111102099979. The next prime is 111111102100027. The reversal of 111111102100021 is 120001201111111.

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

It is a cyclic number.

It is not a de Polignac number, because 111111102100021 - 2⁹ = 111111102099509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 111111102099974 and 111111102100010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111111102100027) 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, 56533605 + ... + 58465978.

It is an arithmetic number, because the mean of its divisors is an integer number (13920699643200).

Almost surely, 2^{111111102100021} is an apocalyptic number.

It is an amenable number.

111111102100021 is a deficient number, since it is larger than the sum of its proper divisors (254495045579).

111111102100021 is a wasteful number, since it uses less digits than its factorization.

111111102100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115001795.

The product of its (nonzero) digits is 4, while the sum is 13.

Adding to 111111102100021 its reverse (120001201111111), we get a palindrome (231112303211132).

The spelling of 111111102100021 in words is "one hundred eleven trillion, one hundred eleven billion, one hundred two million, one hundred thousand, twenty-one".