221220122201 has 4 divisors (see below), whose sum is σ = 238237054692. Its totient is φ = 204203189712.

The previous prime is 221220122197. The next prime is 221220122257. The reversal of 221220122201 is 102221022122.

It is a happy number.

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 68885251600 + 152334870601 = 262460^2 + 390301^2 .

It is a cyclic number.

It is not a de Polignac number, because 221220122201 - 2² = 221220122197 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 221220122201.

It is not an unprimeable number, because it can be changed into a prime (221220122281) 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, 8508466226 + ... + 8508466251.

It is an arithmetic number, because the mean of its divisors is an integer number (59559263673).

Almost surely, 2^221220122201 is an apocalyptic number.

It is an amenable number.

221220122201 is a deficient number, since it is larger than the sum of its proper divisors (17016932491).

221220122201 is a wasteful number, since it uses less digits than its factorization.

221220122201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17016932490.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 221220122201 its reverse (102221022122), we get a palindrome (323441144323).

The spelling of 221220122201 in words is "two hundred twenty-one billion, two hundred twenty million, one hundred twenty-two thousand, two hundred one".