2001220221212 has 6 divisors (see below), whose sum is σ = 3502135387128. Its totient is φ = 1000610110604.

The previous prime is 2001220221211. The next prime is 2001220221263. The reversal of 2001220221212 is 2121220221002.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001220221211) by changing a digit.

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 as a sum of consecutive naturals, namely, 250152527648 + ... + 250152527655.

It is an arithmetic number, because the mean of its divisors is an integer number (583689231188).

Almost surely, 2^{2001220221212} is an apocalyptic number.

It is an amenable number.

2001220221212 is a deficient number, since it is larger than the sum of its proper divisors (1500915165916).

2001220221212 is a wasteful number, since it uses less digits than its factorization.

2001220221212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500305055307 (or 500305055305 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 2001220221212 its reverse (2121220221002), we get a palindrome (4122440442214).

The spelling of 2001220221212 in words is "two trillion, one billion, two hundred twenty million, two hundred twenty-one thousand, two hundred twelve".