2001222221212 has 24 divisors (see below), whose sum is σ = 3577059097920. Its totient is φ = 979210176960.

The previous prime is 2001222221209. The next prime is 2001222221237. The reversal of 2001222221212 is 2121222221002.

It is a self number, because there is not a number n which added to its sum of digits gives 2001222221212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1065214 + ... + 2266522.

It is an arithmetic number, because the mean of its divisors is an integer number (149044129080).

Almost surely, 2^{2001222221212} is an apocalyptic number.

It is an amenable number.

2001222221212 is a deficient number, since it is larger than the sum of its proper divisors (1575836876708).

2001222221212 is a wasteful number, since it uses less digits than its factorization.

2001222221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1210221 (or 1210219 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 19.

Adding to 2001222221212 its reverse (2121222221002), we get a palindrome (4122444442214).

The spelling of 2001222221212 in words is "two trillion, one billion, two hundred twenty-two million, two hundred twenty-one thousand, two hundred twelve".