20201121011171 has 2 divisors, whose sum is σ = 20201121011172. Its totient is φ = 20201121011170.

The previous prime is 20201121011161. The next prime is 20201121011233. The reversal of 20201121011171 is 17111012110202.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20201121011171 is a prime.

It is not a weakly prime, because it can be changed into another prime (20201121011101) 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, 10100560505585 + 10100560505586.

It is an arithmetic number, because the mean of its divisors is an integer number (10100560505586).

Almost surely, 2^{20201121011171} is an apocalyptic number.

20201121011171 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201121011171 is an equidigital number, since it uses as much as digits as its factorization.

20201121011171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 56, while the sum is 20.

Adding to 20201121011171 its reverse (17111012110202), we get a palindrome (37312133121373).

The spelling of 20201121011171 in words is "twenty trillion, two hundred one billion, one hundred twenty-one million, eleven thousand, one hundred seventy-one".