21002200102009 has 32 divisors (see below), whose sum is σ = 25300362078720. Its totient is φ = 17052052372992.

The previous prime is 21002200101983. The next prime is 21002200102027. The reversal of 21002200102009 is 90020100220012.

It is not a de Polignac number, because 21002200102009 - 2⁹ = 21002200101497 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21002200102099) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 186967549 + ... + 187079845.

It is an arithmetic number, because the mean of its divisors is an integer number (790636314960).

Almost surely, 2^{21002200102009} is an apocalyptic number.

21002200102009 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21002200102009 is a deficient number, since it is larger than the sum of its proper divisors (4298161976711).

21002200102009 is a wasteful number, since it uses less digits than its factorization.

21002200102009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129769.

The product of its (nonzero) digits is 144, while the sum is 19.

The spelling of 21002200102009 in words is "twenty-one trillion, two billion, two hundred million, one hundred two thousand, nine".