20201100221 has 32 divisors (see below), whose sum is σ = 22072393728. Its totient is φ = 18415456000.

The previous prime is 20201100151. The next prime is 20201100223. The reversal of 20201100221 is 12200110202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 20201100221 - 2¹⁰ = 20201099197 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 (20201100223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52744196 + ... + 52744578.

It is an arithmetic number, because the mean of its divisors is an integer number (689762304).

Almost surely, 2^20201100221 is an apocalyptic number.

It is an amenable number.

20201100221 is a deficient number, since it is larger than the sum of its proper divisors (1871293507).

20201100221 is a wasteful number, since it uses less digits than its factorization.

20201100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 961.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20201100221 its reverse (12200110202), we get a palindrome (32401210423).

The spelling of 20201100221 in words is "twenty billion, two hundred one million, one hundred thousand, two hundred twenty-one".