2001002212221 has 16 divisors (see below), whose sum is σ = 2686269139008. Its totient is φ = 1324887753600.

The previous prime is 2001002212219. The next prime is 2001002212273. The reversal of 2001002212221 is 1222122001002.

It is not a de Polignac number, because 2001002212221 - 2¹ = 2001002212219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2001002212221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2001002212021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2007991 + ... + 2834436.

It is an arithmetic number, because the mean of its divisors is an integer number (167891821188).

Almost surely, 2^{2001002212221} is an apocalyptic number.

It is an amenable number.

2001002212221 is a deficient number, since it is larger than the sum of its proper divisors (685266926787).

2001002212221 is a wasteful number, since it uses less digits than its factorization.

2001002212221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4843372.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 2001002212221 its reverse (1222122001002), we get a palindrome (3223124213223).

The spelling of 2001002212221 in words is "two trillion, one billion, two million, two hundred twelve thousand, two hundred twenty-one".