20001011011243 has 2 divisors, whose sum is σ = 20001011011244. Its totient is φ = 20001011011242.

The previous prime is 20001011011217. The next prime is 20001011011337. The reversal of 20001011011243 is 34211011010002.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20001011011243 - 2¹⁷ = 20001010880171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20001011011043) 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, 10000505505621 + 10000505505622.

It is an arithmetic number, because the mean of its divisors is an integer number (10000505505622).

Almost surely, 2^{20001011011243} is an apocalyptic number.

20001011011243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20001011011243 is an equidigital number, since it uses as much as digits as its factorization.

20001011011243 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20001011011243 its reverse (34211011010002), we get a palindrome (54212022021245).

The spelling of 20001011011243 in words is "twenty trillion, one billion, eleven million, eleven thousand, two hundred forty-three".