221320442201 has 4 divisors (see below), whose sum is σ = 227302075812. Its totient is φ = 215338808592.

The previous prime is 221320442179. The next prime is 221320442227. The reversal of 221320442201 is 102244023122.

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 117871368976 + 103449073225 = 343324^2 + 321635^2 .

It is a cyclic number.

It is not a de Polignac number, because 221320442201 - 2²² = 221316247897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (221320445201) 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, 2990816750 + ... + 2990816823.

It is an arithmetic number, because the mean of its divisors is an integer number (56825518953).

Almost surely, 2^221320442201 is an apocalyptic number.

It is an amenable number.

221320442201 is a deficient number, since it is larger than the sum of its proper divisors (5981633611).

221320442201 is an equidigital number, since it uses as much as digits as its factorization.

221320442201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5981633610.

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 221320442201 its reverse (102244023122), we get a palindrome (323564465323).

The spelling of 221320442201 in words is "two hundred twenty-one billion, three hundred twenty million, four hundred forty-two thousand, two hundred one".