21110002122101 has 4 divisors (see below), whose sum is σ = 21319012044204. Its totient is φ = 20900992200000.

The previous prime is 21110002122091. The next prime is 21110002122103. The reversal of 21110002122101 is 10122120001112.

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 19645238967025 + 1464763155076 = 4432295^2 + 1210274^2 .

It is a cyclic number.

It is not a de Polignac number, because 21110002122101 - 2³⁰ = 21108928380277 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 (21110002122103) 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, 104504960900 + ... + 104504961101.

It is an arithmetic number, because the mean of its divisors is an integer number (5329753011051).

Almost surely, 2^{21110002122101} is an apocalyptic number.

It is an amenable number.

21110002122101 is a deficient number, since it is larger than the sum of its proper divisors (209009922103).

21110002122101 is a wasteful number, since it uses less digits than its factorization.

21110002122101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209009922102.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21110002122101 its reverse (10122120001112), we get a palindrome (31232122123213).

The spelling of 21110002122101 in words is "twenty-one trillion, one hundred ten billion, two million, one hundred twenty-two thousand, one hundred one".