20201100002221 has 4 divisors (see below), whose sum is σ = 20897689657500. Its totient is φ = 19504510346944.

The previous prime is 20201100002203. The next prime is 20201100002231. The reversal of 20201100002221 is 12220000110202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 5725061144100 + 14476038858121 = 2392710^2 + 3804739^2 .

It is a cyclic number.

It is not a de Polignac number, because 20201100002221 - 2⁵ = 20201100002189 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 (20201100002231) 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, 348294827596 + ... + 348294827653.

It is an arithmetic number, because the mean of its divisors is an integer number (5224422414375).

Almost surely, 2^{20201100002221} is an apocalyptic number.

It is an amenable number.

20201100002221 is a deficient number, since it is larger than the sum of its proper divisors (696589655279).

20201100002221 is an equidigital number, since it uses as much as digits as its factorization.

20201100002221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696589655278.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20201100002221 its reverse (12220000110202), we get a palindrome (32421100112423).

The spelling of 20201100002221 in words is "twenty trillion, two hundred one billion, one hundred million, two thousand, two hundred twenty-one".