2001222221211 has 12 divisors (see below), whose sum is σ = 2906803228680. Its totient is φ = 1326694804800.

The previous prime is 2001222221209. The next prime is 2001222221237. The reversal of 2001222221211 is 1121222221002.

It is a happy number.

2001222221211 is a `hidden beast` number, since 200 + 1 + 222 + 221 + 21 + 1 = 666.

It is not a de Polignac number, because 2001222221211 - 2¹ = 2001222221209 is a prime.

It is a super-4 number, since 4×2001222221211⁴ (a number of 50 digits) contains 4444 as substring.

It is not an unprimeable number, because it can be changed into a prime (2001222221291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 621110190 + ... + 621113411.

It is an arithmetic number, because the mean of its divisors is an integer number (242233602390).

Almost surely, 2^{2001222221211} is an apocalyptic number.

2001222221211 is a deficient number, since it is larger than the sum of its proper divisors (905581007469).

2001222221211 is a wasteful number, since it uses less digits than its factorization.

2001222221211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1242223786 (or 1242223783 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 2001222221211 its reverse (1121222221002), we get a palindrome (3122444442213).

The spelling of 2001222221211 in words is "two trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred eleven".