221220100201 has 8 divisors (see below), whose sum is σ = 221927055624. Its totient is φ = 220514273280.

The previous prime is 221220100177. The next prime is 221220100237. The reversal of 221220100201 is 102001022122.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1541347600 + 219678752601 = 39260^2 + 468699^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 221220100201 - 2³⁵ = 186860361833 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221220100291) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111435 + ... + 674431.

It is an arithmetic number, because the mean of its divisors is an integer number (27740881953).

Almost surely, 2^221220100201 is an apocalyptic number.

It is an amenable number.

221220100201 is a deficient number, since it is larger than the sum of its proper divisors (706955423).

221220100201 is an equidigital number, since it uses as much as digits as its factorization.

221220100201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 564251.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 221220100201 its reverse (102001022122), we get a palindrome (323221122323).

The spelling of 221220100201 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred thousand, two hundred one".