2001221003311 has 2 divisors, whose sum is σ = 2001221003312. Its totient is φ = 2001221003310.

The previous prime is 2001221003191. The next prime is 2001221003387. The reversal of 2001221003311 is 1133001221002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221003311 - 2⁹ = 2001221002799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2001221033311) 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, 1000610501655 + 1000610501656.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610501656).

Almost surely, 2^{2001221003311} is an apocalyptic number.

2001221003311 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221003311 is an equidigital number, since it uses as much as digits as its factorization.

2001221003311 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 2001221003311 its reverse (1133001221002), we get a palindrome (3134222224313).

The spelling of 2001221003311 in words is "two trillion, one billion, two hundred twenty-one million, three thousand, three hundred eleven".