21200221002109 has 16 divisors (see below), whose sum is σ = 22204305789120. Its totient is φ = 20214534856320.

The previous prime is 21200221002089. The next prime is 21200221002113. The reversal of 21200221002109 is 90120012200212.

It is not a de Polignac number, because 21200221002109 - 2³³ = 21191631067517 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21200221002109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200221002119) 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, 4321174 + ... + 7814920.

It is an arithmetic number, because the mean of its divisors is an integer number (1387769111820).

Almost surely, 2^{21200221002109} is an apocalyptic number.

21200221002109 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

21200221002109 is a deficient number, since it is larger than the sum of its proper divisors (1004084787011).

21200221002109 is a wasteful number, since it uses less digits than its factorization.

21200221002109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3496380.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21200221002109 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, two thousand, one hundred nine".