201020100221 has 4 divisors (see below), whose sum is σ = 201921535872. Its totient is φ = 200118664572.

The previous prime is 201020100173. The next prime is 201020100289. The reversal of 201020100221 is 122001020102.

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 201020100221 - 2¹⁴ = 201020083837 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 (201020109221) 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, 450717491 + ... + 450717936.

It is an arithmetic number, because the mean of its divisors is an integer number (50480383968).

Almost surely, 2^201020100221 is an apocalyptic number.

It is an amenable number.

201020100221 is a deficient number, since it is larger than the sum of its proper divisors (901435651).

201020100221 is an equidigital number, since it uses as much as digits as its factorization.

201020100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 901435650.

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

Adding to 201020100221 its reverse (122001020102), we get a palindrome (323021120323).

The spelling of 201020100221 in words is "two hundred one billion, twenty million, one hundred thousand, two hundred twenty-one".