21100120110101 has 8 divisors (see below), whose sum is σ = 21133458990720. Its totient is φ = 21066783473488.

The previous prime is 21100120110089. The next prime is 21100120110107. The reversal of 21100120110101 is 10101102100112.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100120110101 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 (21100120110107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18785975 + ... + 19877451.

It is an arithmetic number, because the mean of its divisors is an integer number (2641682373840).

Almost surely, 2^{21100120110101} is an apocalyptic number.

It is an amenable number.

21100120110101 is a deficient number, since it is larger than the sum of its proper divisors (33338880619).

21100120110101 is a wasteful number, since it uses less digits than its factorization.

21100120110101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1122003.

The product of its (nonzero) digits is 4, while the sum is 11.

Adding to 21100120110101 its reverse (10101102100112), we get a palindrome (31201222210213).

The spelling of 21100120110101 in words is "twenty-one trillion, one hundred billion, one hundred twenty million, one hundred ten thousand, one hundred one".