20111111010143 has 2 divisors, whose sum is σ = 20111111010144. Its totient is φ = 20111111010142.

The previous prime is 20111111010101. The next prime is 20111111010173. The reversal of 20111111010143 is 34101011111102.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20111111010143 - 2⁸ = 20111111009887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20111111010173) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10055555505071 + 10055555505072.

It is an arithmetic number, because the mean of its divisors is an integer number (10055555505072).

Almost surely, 2^{20111111010143} is an apocalyptic number.

20111111010143 is a deficient number, since it is larger than the sum of its proper divisors (1).

20111111010143 is an equidigital number, since it uses as much as digits as its factorization.

20111111010143 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24, while the sum is 17.

Adding to 20111111010143 its reverse (34101011111102), we get a palindrome (54212122121245).

The spelling of 20111111010143 in words is "twenty trillion, one hundred eleven billion, one hundred eleven million, ten thousand, one hundred forty-three".