2001221021011 has 2 divisors, whose sum is σ = 2001221021012. Its totient is φ = 2001221021010.

The previous prime is 2001221020987. The next prime is 2001221021039. The reversal of 2001221021011 is 1101201221002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2001221021011 - 2¹⁵ = 2001220988243 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2001221020982 and 2001221021000.

It is not a weakly prime, because it can be changed into another prime (2001221021711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1000610510505 + 1000610510506.

It is an arithmetic number, because the mean of its divisors is an integer number (1000610510506).

Almost surely, 2^{2001221021011} is an apocalyptic number.

2001221021011 is a deficient number, since it is larger than the sum of its proper divisors (1).

2001221021011 is an equidigital number, since it uses as much as digits as its factorization.

2001221021011 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 2001221021011 its reverse (1101201221002), we get a palindrome (3102422242013).

The spelling of 2001221021011 in words is "two trillion, one billion, two hundred twenty-one million, twenty-one thousand, eleven".