2001201222211 has 4 divisors (see below), whose sum is σ = 2001350791024. Its totient is φ = 2001051653400.

The previous prime is 2001201222173. The next prime is 2001201222221. The reversal of 2001201222211 is 1122221021002.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2001201222211 - 2⁹ = 2001201221699 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2001201222221) 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, 74764335 + ... + 74791096.

It is an arithmetic number, because the mean of its divisors is an integer number (500337697756).

Almost surely, 2^{2001201222211} is an apocalyptic number.

2001201222211 is a deficient number, since it is larger than the sum of its proper divisors (149568813).

2001201222211 is a wasteful number, since it uses less digits than its factorization.

2001201222211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149568812.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 2001201222211 its reverse (1122221021002), we get a palindrome (3123422243213).

The spelling of 2001201222211 in words is "two trillion, one billion, two hundred one million, two hundred twenty-two thousand, two hundred eleven".