21010200021101 has 4 divisors (see below), whose sum is σ = 21206557030752. Its totient is φ = 20813843011452.

The previous prime is 21010200021091. The next prime is 21010200021169. The reversal of 21010200021101 is 10112000201012.

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 21010200021101 - 2⁶ = 21010200021037 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010200021301) 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, 98178504665 + ... + 98178504878.

It is an arithmetic number, because the mean of its divisors is an integer number (5301639257688).

Almost surely, 2^{21010200021101} is an apocalyptic number.

It is an amenable number.

21010200021101 is a deficient number, since it is larger than the sum of its proper divisors (196357009651).

21010200021101 is a wasteful number, since it uses less digits than its factorization.

21010200021101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 196357009650.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21010200021101 its reverse (10112000201012), we get a palindrome (31122200222113).

The spelling of 21010200021101 in words is "twenty-one trillion, ten billion, two hundred million, twenty-one thousand, one hundred one".