21010020201105 has 16 divisors (see below), whose sum is σ = 36201880962240. Its totient is φ = 10343394560448.

The previous prime is 21010020201103. The next prime is 21010020201167. The reversal of 21010020201105 is 50110202001012.

It is not a de Polignac number, because 21010020201105 - 2¹ = 21010020201103 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is not an unprimeable number, because it can be changed into a prime (21010020201103) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53871846475 + ... + 53871846864.

It is an arithmetic number, because the mean of its divisors is an integer number (2262617560140).

Almost surely, 2^{21010020201105} is an apocalyptic number.

It is an amenable number.

21010020201105 is a deficient number, since it is larger than the sum of its proper divisors (15191860761135).

21010020201105 is a wasteful number, since it uses less digits than its factorization.

21010020201105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107743693360.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 21010020201105 its reverse (50110202001012), we get a palindrome (71120222202117).

The spelling of 21010020201105 in words is "twenty-one trillion, ten billion, twenty million, two hundred one thousand, one hundred five".