21002101110205 has 32 divisors (see below), whose sum is σ = 26750641499136. Its totient is φ = 15774497915904.

The previous prime is 21002101110127. The next prime is 21002101110223. The reversal of 21002101110205 is 50201110120012.

It is not a de Polignac number, because 21002101110205 - 2²⁵ = 21002067555773 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74111092 + ... + 74393938.

It is an arithmetic number, because the mean of its divisors is an integer number (835957546848).

Almost surely, 2^{21002101110205} is an apocalyptic number.

It is an amenable number.

21002101110205 is a deficient number, since it is larger than the sum of its proper divisors (5748540388931).

21002101110205 is a wasteful number, since it uses less digits than its factorization.

21002101110205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285013.

The product of its (nonzero) digits is 40, while the sum is 16.

Adding to 21002101110205 its reverse (50201110120012), we get a palindrome (71203211230217).

The spelling of 21002101110205 in words is "twenty-one trillion, two billion, one hundred one million, one hundred ten thousand, two hundred five".