2220001221221 has 64 divisors (see below), whose sum is σ = 2763136696320. Its totient is φ = 1741782873600.

The previous prime is 2220001221197. The next prime is 2220001221271. The reversal of 2220001221221 is 1221221000222.

It is a happy number.

It is not a de Polignac number, because 2220001221221 - 2³⁴ = 2202821352037 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 2220001221221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2220001221271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 242591996 + ... + 242601146.

It is an arithmetic number, because the mean of its divisors is an integer number (43174010880).

Almost surely, 2^{2220001221221} is an apocalyptic number.

It is an amenable number.

2220001221221 is a deficient number, since it is larger than the sum of its proper divisors (543135475099).

2220001221221 is a wasteful number, since it uses less digits than its factorization.

2220001221221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9666.

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

Adding to 2220001221221 its reverse (1221221000222), we get a palindrome (3441222221443).

The spelling of 2220001221221 in words is "two trillion, two hundred twenty billion, one million, two hundred twenty-one thousand, two hundred twenty-one".