20010111101243 has 2 divisors, whose sum is σ = 20010111101244. Its totient is φ = 20010111101242.

The previous prime is 20010111101221. The next prime is 20010111101251. The reversal of 20010111101243 is 34210111101002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20010111101243 - 2¹⁸ = 20010110839099 is a prime.

It is a super-2 number, since 2×20010111101243² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20010111101203) 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 as a sum of consecutive naturals, namely, 10005055550621 + 10005055550622.

It is an arithmetic number, because the mean of its divisors is an integer number (10005055550622).

Almost surely, 2^{20010111101243} is an apocalyptic number.

20010111101243 is a deficient number, since it is larger than the sum of its proper divisors (1).

20010111101243 is an equidigital number, since it uses as much as digits as its factorization.

20010111101243 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 17.

Adding to 20010111101243 its reverse (34210111101002), we get a palindrome (54220222202245).

The spelling of 20010111101243 in words is "twenty trillion, ten billion, one hundred eleven million, one hundred one thousand, two hundred forty-three".