2001221212 has 24 divisors (see below), whose sum is σ = 3641148000. Its totient is φ = 961240896.

The previous prime is 2001221203. The next prime is 2001221239. The reversal of 2001221212 is 2121221002.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 2001221192 and 2001221201.

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, 20263 + ... + 66430.

It is an arithmetic number, because the mean of its divisors is an integer number (151714500).

Almost surely, 2^2001221212 is an apocalyptic number.

It is an amenable number.

2001221212 is a deficient number, since it is larger than the sum of its proper divisors (1639926788).

2001221212 is a wasteful number, since it uses less digits than its factorization.

2001221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86925 (or 86923 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 2001221212 is about 44735.0110316294. The cubic root of 2001221212 is about 1260.1774361692.

Adding to 2001221212 its reverse (2121221002), we get a palindrome (4122442214).

The spelling of 2001221212 in words is "two billion, one million, two hundred twenty-one thousand, two hundred twelve".