2001222033221 has 4 divisors (see below), whose sum is σ = 2001351184812. Its totient is φ = 2001092881632.

The previous prime is 2001222033199. The next prime is 2001222033233. The reversal of 2001222033221 is 1223302221002.

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 1884607296100 + 116614737121 = 1372810^2 + 341489^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001222033221 - 2²⁶ = 2001154924357 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2001222033193 and 2001222033202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001222033271) 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, 64552550 + ... + 64583543.

It is an arithmetic number, because the mean of its divisors is an integer number (500337796203).

Almost surely, 2^{2001222033221} is an apocalyptic number.

It is an amenable number.

2001222033221 is a deficient number, since it is larger than the sum of its proper divisors (129151591).

2001222033221 is a wasteful number, since it uses less digits than its factorization.

2001222033221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129151590.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 2001222033221 its reverse (1223302221002), we get a palindrome (3224524254223).

The spelling of 2001222033221 in words is "two trillion, one billion, two hundred twenty-two million, thirty-three thousand, two hundred twenty-one".