222001220100221 has 8 divisors (see below), whose sum is σ = 235060276148280. Its totient is φ = 208942181913088.

The previous prime is 222001220100133. The next prime is 222001220100241. The reversal of 222001220100221 is 122001022100222.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 55265619787225 + 166735600312996 = 7434085^2 + 12912614^2 .

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 222001220100221 - 2¹⁴ = 222001220083837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

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 222001220100221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (222001220100241) 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, 27776375 + ... + 34864443.

It is an arithmetic number, because the mean of its divisors is an integer number (29382534518535).

Almost surely, 2^{222001220100221} is an apocalyptic number.

It is an amenable number.

222001220100221 is a deficient number, since it is larger than the sum of its proper divisors (13059056048059).

222001220100221 is a wasteful number, since it uses less digits than its factorization.

222001220100221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8930463.

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

Adding to 222001220100221 its reverse (122001022100222), we get a palindrome (344002242200443).

The spelling of 222001220100221 in words is "two hundred twenty-two trillion, one billion, two hundred twenty million, one hundred thousand, two hundred twenty-one".