20001100110021 has 24 divisors (see below), whose sum is σ = 29012246640000. Its totient is φ = 13277869218432.

The previous prime is 20001100110011. The next prime is 20001100110053. The reversal of 20001100110021 is 12001100110002.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-20001100110021 is a prime.

It is a super-2 number, since 2×20001100110021² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 20001100109985 and 20001100110012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001100110011) 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 23 ways as a sum of consecutive naturals, for example, 80859510 + ... + 81106488.

It is an arithmetic number, because the mean of its divisors is an integer number (1208843610000).

Almost surely, 2^{20001100110021} is an apocalyptic number.

It is an amenable number.

20001100110021 is a deficient number, since it is larger than the sum of its proper divisors (9011146529979).

20001100110021 is a wasteful number, since it uses less digits than its factorization.

20001100110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284873 (or 284870 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 20001100110021 its reverse (12001100110002), we get a palindrome (32002200220023).

The spelling of 20001100110021 in words is "twenty trillion, one billion, one hundred million, one hundred ten thousand, twenty-one".