21000020110000 has 100 divisors (see below), whose sum is σ = 50878175734672. Its totient is φ = 8394221088000.

The previous prime is 21000020109989. The next prime is 21000020110039. The reversal of 21000020110000 is 1102000012.

It is a tau number, because it is divible by the number of its divisors (100).

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 13807357 + ... + 15252643.

Almost surely, 2^{21000020110000} is an apocalyptic number.

21000020110000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21000020110000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (25439087867336).

21000020110000 is an abundant number, since it is smaller than the sum of its proper divisors (29878155624672).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21000020110000 is a wasteful number, since it uses less digits than its factorization.

21000020110000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1446768 (or 1446747 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21000020110000 its reverse (1102000012), we get a palindrome (21001122110012).

The spelling of 21000020110000 in words is "twenty-one trillion, twenty million, one hundred ten thousand".