2201002212221 has 4 divisors (see below), whose sum is σ = 2201005196412. Its totient is φ = 2200999228032.

The previous prime is 2201002212217. The next prime is 2201002212347. The reversal of 2201002212221 is 1222122001022.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 28874505625 + 2172127706596 = 169925^2 + 1473814^2 .

It is a cyclic number.

It is not a de Polignac number, because 2201002212221 - 2² = 2201002212217 is a prime.

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 2201002212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201002212121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 507245 + ... + 2158541.

It is an arithmetic number, because the mean of its divisors is an integer number (550251299103).

Almost surely, 2^{2201002212221} is an apocalyptic number.

It is an amenable number.

2201002212221 is a deficient number, since it is larger than the sum of its proper divisors (2984191).

2201002212221 is a wasteful number, since it uses less digits than its factorization.

2201002212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2984190.

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

Adding to 2201002212221 its reverse (1222122001022), we get a palindrome (3423124213243).

The spelling of 2201002212221 in words is "two trillion, two hundred one billion, two million, two hundred twelve thousand, two hundred twenty-one".