21102110211101 has 4 divisors (see below), whose sum is σ = 22343410811772. Its totient is φ = 19860809610432.

The previous prime is 21102110211079. The next prime is 21102110211137. The reversal of 21102110211101 is 10111201120112.

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 19714496890201 + 1387613320900 = 4440101^2 + 1177970^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21102110211101 is a prime.

It is a super-2 number, since 2×21102110211101² (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 (21102110213101) 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, 620650300310 + ... + 620650300343.

It is an arithmetic number, because the mean of its divisors is an integer number (5585852702943).

Almost surely, 2^{21102110211101} is an apocalyptic number.

It is an amenable number.

21102110211101 is a deficient number, since it is larger than the sum of its proper divisors (1241300600671).

21102110211101 is a wasteful number, since it uses less digits than its factorization.

21102110211101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1241300600670.

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

Adding to 21102110211101 its reverse (10111201120112), we get a palindrome (31213311331213).

The spelling of 21102110211101 in words is "twenty-one trillion, one hundred two billion, one hundred ten million, two hundred eleven thousand, one hundred one".