2001021022201 has 4 divisors (see below), whose sum is σ = 2118728141172. Its totient is φ = 1883313903232.

The previous prime is 2001021022193. The next prime is 2001021022237. The reversal of 2001021022201 is 1022201201002.

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 1639170650601 + 361850371600 = 1280301^2 + 601540^2 .

It is a cyclic number.

It is not a de Polignac number, because 2001021022201 - 2³ = 2001021022193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001021022261) 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, 58853559460 + ... + 58853559493.

It is an arithmetic number, because the mean of its divisors is an integer number (529682035293).

Almost surely, 2^{2001021022201} is an apocalyptic number.

It is an amenable number.

2001021022201 is a deficient number, since it is larger than the sum of its proper divisors (117707118971).

2001021022201 is a wasteful number, since it uses less digits than its factorization.

2001021022201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117707118970.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 2001021022201 its reverse (1022201201002), we get a palindrome (3023222223203).

The spelling of 2001021022201 in words is "two trillion, one billion, twenty-one million, twenty-two thousand, two hundred one".