21111201111101 has 4 divisors (see below), whose sum is σ = 21111247870332. Its totient is φ = 21111154351872.

The previous prime is 21111201111083. The next prime is 21111201111173. The reversal of 21111201111101 is 10111110211112.

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 8742228639076 + 12368972472025 = 2956726^2 + 3516955^2 .

It is a cyclic number.

It is not a de Polignac number, because 21111201111101 - 2³⁰ = 21110127369277 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21111201111001) 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 3 ways as a sum of consecutive naturals, for example, 22695716 + ... + 23607581.

It is an arithmetic number, because the mean of its divisors is an integer number (5277811967583).

Almost surely, 2^{21111201111101} is an apocalyptic number.

It is an amenable number.

21111201111101 is a deficient number, since it is larger than the sum of its proper divisors (46759231).

21111201111101 is an equidigital number, since it uses as much as digits as its factorization.

21111201111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46759230.

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

Adding to 21111201111101 its reverse (10111110211112), we get a palindrome (31222311322213).

The spelling of 21111201111101 in words is "twenty-one trillion, one hundred eleven billion, two hundred one million, one hundred eleven thousand, one hundred one".