2201222001221 has 4 divisors (see below), whose sum is σ = 2201258723244. Its totient is φ = 2201185279200.

The previous prime is 2201222001179. The next prime is 2201222001229. The reversal of 2201222001221 is 1221002221022.

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 1698981902500 + 502240098721 = 1303450^2 + 708689^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2201222001221 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2201222001221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2201222001229) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18270950 + ... + 18391031.

It is an arithmetic number, because the mean of its divisors is an integer number (550314680811).

Almost surely, 2^{2201222001221} is an apocalyptic number.

It is an amenable number.

2201222001221 is a deficient number, since it is larger than the sum of its proper divisors (36722023).

2201222001221 is an equidigital number, since it uses as much as digits as its factorization.

2201222001221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36722022.

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

Adding to 2201222001221 its reverse (1221002221022), we get a palindrome (3422224222243).

The spelling of 2201222001221 in words is "two trillion, two hundred one billion, two hundred twenty-two million, one thousand, two hundred twenty-one".