2001221212222 has 16 divisors (see below), whose sum is σ = 3035618402400. Its totient is φ = 989348842240.

The previous prime is 2001221212217. The next prime is 2001221212253. The reversal of 2001221212222 is 2222121221002.

It is a self number, because there is not a number n which added to its sum of digits gives 2001221212222.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15780447 + ... + 15906757.

It is an arithmetic number, because the mean of its divisors is an integer number (189726150150).

Almost surely, 2^{2001221212222} is an apocalyptic number.

2001221212222 is a deficient number, since it is larger than the sum of its proper divisors (1034397190178).

2001221212222 is a wasteful number, since it uses less digits than its factorization.

2001221212222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215411.

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

Adding to 2001221212222 its reverse (2222121221002), we get a palindrome (4223342433224).

The spelling of 2001221212222 in words is "two trillion, one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred twenty-two".