21101120112101 has 4 divisors (see below), whose sum is σ = 21208232397132. Its totient is φ = 20994007827072.

The previous prime is 21101120112097. The next prime is 21101120112139. The reversal of 21101120112101 is 10121102110112.

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 14102841390625 + 6998278721476 = 3755375^2 + 2645426^2 .

It is a cyclic number.

It is not a de Polignac number, because 21101120112101 - 2² = 21101120112097 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 (21101120112901) 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, 53556142220 + ... + 53556142613.

It is an arithmetic number, because the mean of its divisors is an integer number (5302058099283).

Almost surely, 2^{21101120112101} is an apocalyptic number.

It is an amenable number.

21101120112101 is a deficient number, since it is larger than the sum of its proper divisors (107112285031).

21101120112101 is a wasteful number, since it uses less digits than its factorization.

21101120112101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107112285030.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 21101120112101 its reverse (10121102110112), we get a palindrome (31222222222213).

The spelling of 21101120112101 in words is "twenty-one trillion, one hundred one billion, one hundred twenty million, one hundred twelve thousand, one hundred one".