2001212222112 has 72 divisors (see below), whose sum is σ = 5775886823616. Its totient is φ = 657114454656.

The previous prime is 2001212222099. The next prime is 2001212222131. The reversal of 2001212222112 is 2112222121002.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 51836328 + ... + 51874919.

It is an arithmetic number, because the mean of its divisors is an integer number (80220650328).

Almost surely, 2^{2001212222112} is an apocalyptic number.

It is an amenable number.

2001212222112 is an abundant number, since it is smaller than the sum of its proper divisors (3774674601504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2001212222112 is a wasteful number, since it uses less digits than its factorization.

2001212222112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 103711330 (or 103711319 counting only the distinct ones).

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

Adding to 2001212222112 its reverse (2112222121002), we get a palindrome (4113434343114).

The spelling of 2001212222112 in words is "two trillion, one billion, two hundred twelve million, two hundred twenty-two thousand, one hundred twelve".