21100121001101 has 4 divisors (see below), whose sum is σ = 21100145491872. Its totient is φ = 21100096510332.

The previous prime is 21100121001097. The next prime is 21100121001163. The reversal of 21100121001101 is 10110012100112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21100121001101 - 2² = 21100121001097 is a prime.

It is a super-2 number, since 2×21100121001101² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100121001181) 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, 10904081 + ... + 12692486.

It is an arithmetic number, because the mean of its divisors is an integer number (5275036372968).

Almost surely, 2^{21100121001101} is an apocalyptic number.

It is an amenable number.

21100121001101 is a deficient number, since it is larger than the sum of its proper divisors (24490771).

21100121001101 is an equidigital number, since it uses as much as digits as its factorization.

21100121001101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24490770.

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

Adding to 21100121001101 its reverse (10110012100112), we get a palindrome (31210133101213).

It can be divided in two parts, 2110012 and 1001101, that added together give a palindrome (3111113).

The spelling of 21100121001101 in words is "twenty-one trillion, one hundred billion, one hundred twenty-one million, one thousand, one hundred one".