20201220121111 has 2 divisors, whose sum is σ = 20201220121112. Its totient is φ = 20201220121110.

The previous prime is 20201220121087. The next prime is 20201220121171. The reversal of 20201220121111 is 11112102210202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20201220121111 - 2³¹ = 20199072637463 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20201220121171) 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, 10100610060555 + 10100610060556.

It is an arithmetic number, because the mean of its divisors is an integer number (10100610060556).

Almost surely, 2^{20201220121111} is an apocalyptic number.

20201220121111 is a deficient number, since it is larger than the sum of its proper divisors (1).

20201220121111 is an equidigital number, since it uses as much as digits as its factorization.

20201220121111 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20201220121111 its reverse (11112102210202), we get a palindrome (31313322331313).

The spelling of 20201220121111 in words is "twenty trillion, two hundred one billion, two hundred twenty million, one hundred twenty-one thousand, one hundred eleven".