201000000221 has 4 divisors (see below), whose sum is σ = 201035041692. Its totient is φ = 200964958752.

The previous prime is 201000000217. The next prime is 201000000251. The reversal of 201000000221 is 122000000102.

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 67332984196 + 133667016025 = 259486^2 + 365605^2 .

It is a cyclic number.

It is not a de Polignac number, because 201000000221 - 2² = 201000000217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201000000199 and 201000000208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201000000251) 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, 17512130 + ... + 17523603.

It is an arithmetic number, because the mean of its divisors is an integer number (50258760423).

Almost surely, 2^201000000221 is an apocalyptic number.

It is an amenable number.

201000000221 is a deficient number, since it is larger than the sum of its proper divisors (35041471).

201000000221 is an equidigital number, since it uses as much as digits as its factorization.

201000000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35041470.

The product of its (nonzero) digits is 8, while the sum is 8.

Adding to 201000000221 its reverse (122000000102), we get a palindrome (323000000323).

The spelling of 201000000221 in words is "two hundred one billion, two hundred twenty-one", and thus it is an aban number.