2001221101212 has 12 divisors (see below), whose sum is σ = 4669515902856. Its totient is φ = 667073700400.

The previous prime is 2001221101211. The next prime is 2001221101213. The reversal of 2001221101212 is 2121011221002.

It is an interprime number because it is at equal distance from previous prime (2001221101211) and next prime (2001221101213).

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 2001221101191 and 2001221101200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001221101211) 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, 83384212539 + ... + 83384212562.

It is an arithmetic number, because the mean of its divisors is an integer number (389126325238).

Almost surely, 2^{2001221101212} is an apocalyptic number.

It is an amenable number.

2001221101212 is an abundant number, since it is smaller than the sum of its proper divisors (2668294801644).

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

2001221101212 is a wasteful number, since it uses less digits than its factorization.

2001221101212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166768425108 (or 166768425106 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 2001221101212 its reverse (2121011221002), we get a palindrome (4122232322214).

The spelling of 2001221101212 in words is "two trillion, one billion, two hundred twenty-one million, one hundred one thousand, two hundred twelve".