21110121211101 has 48 divisors (see below), whose sum is σ = 31480253798400. Its totient is φ = 12564368930880.

The previous prime is 21110121211097. The next prime is 21110121211121. The reversal of 21110121211101 is 10111212101112.

It is not a de Polignac number, because 21110121211101 - 2² = 21110121211097 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21110121211121) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26307910 + ... + 27098456.

It is an arithmetic number, because the mean of its divisors is an integer number (655838620800).

Almost surely, 2^{21110121211101} is an apocalyptic number.

It is an amenable number.

21110121211101 is a deficient number, since it is larger than the sum of its proper divisors (10370132587299).

21110121211101 is a wasteful number, since it uses less digits than its factorization.

21110121211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792306 (or 792293 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 21110121211101 its reverse (10111212101112), we get a palindrome (31221333312213).

The spelling of 21110121211101 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, two hundred eleven thousand, one hundred one".