201100002221 has 4 divisors (see below), whose sum is σ = 201108560352. Its totient is φ = 201091444092.

The previous prime is 201100002209. The next prime is 201100002227. The reversal of 201100002221 is 122200001102.

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, and also an emirpimes, since its reverse is a distinct semiprime: 122200001102 = 2 ⋅61100000551.

It is a cyclic number.

It is not a de Polignac number, because 201100002221 - 2³⁰ = 200026260397 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 (201100002227) 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, 4243721 + ... + 4290846.

It is an arithmetic number, because the mean of its divisors is an integer number (50277140088).

Almost surely, 2^201100002221 is an apocalyptic number.

It is an amenable number.

201100002221 is a deficient number, since it is larger than the sum of its proper divisors (8558131).

201100002221 is an equidigital number, since it uses as much as digits as its factorization.

201100002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8558130.

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

Adding to 201100002221 its reverse (122200001102), we get a palindrome (323300003323).

The spelling of 201100002221 in words is "two hundred one billion, one hundred million, two thousand, two hundred twenty-one".