21100112002111 has 4 divisors (see below), whose sum is σ = 21144162340800. Its totient is φ = 21056061663424.

The previous prime is 21100112002087. The next prime is 21100112002127. The reversal of 21100112002111 is 11120021100112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21100112002111 - 2⁹ = 21100112001599 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21100112002091 and 21100112002100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100112000111) 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, 22025168626 + ... + 22025169583.

It is an arithmetic number, because the mean of its divisors is an integer number (5286040585200).

Almost surely, 2^{21100112002111} is an apocalyptic number.

21100112002111 is a deficient number, since it is larger than the sum of its proper divisors (44050338689).

21100112002111 is an equidigital number, since it uses as much as digits as its factorization.

21100112002111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44050338688.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 21100112002111 its reverse (11120021100112), we get a palindrome (32220133102223).

The spelling of 21100112002111 in words is "twenty-one trillion, one hundred billion, one hundred twelve million, two thousand, one hundred eleven".