2109203607221 has 4 divisors (see below), whose sum is σ = 2109248394912. Its totient is φ = 2109158819532.

The previous prime is 2109203607163. The next prime is 2109203607223. The reversal of 2109203607221 is 1227063029012.

It is a happy number.

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 2109203607221 - 2³⁴ = 2092023738037 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 (2109203607223) 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, 22323131 + ... + 22417416.

It is an arithmetic number, because the mean of its divisors is an integer number (527312098728).

Almost surely, 2^{2109203607221} is an apocalyptic number.

It is an amenable number.

2109203607221 is a deficient number, since it is larger than the sum of its proper divisors (44787691).

2109203607221 is an equidigital number, since it uses as much as digits as its factorization.

2109203607221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44787690.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 2109203607221 in words is "two trillion, one hundred nine billion, two hundred three million, six hundred seven thousand, two hundred twenty-one".