20112111220001 has 4 divisors (see below), whose sum is σ = 20116791724932. Its totient is φ = 20107430715072.

The previous prime is 20112111219989. The next prime is 20112111220027. The reversal of 20112111220001 is 10002211121102.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 11998956530401 + 8113154689600 = 3463951^2 + 2848360^2 .

It is a cyclic number.

It is not a de Polignac number, because 20112111220001 - 2¹⁰ = 20112111218977 is a prime.

It is a super-2 number, since 2×20112111220001² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20112111220081) 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 in 3 ways as a sum of consecutive naturals, for example, 2340246020 + ... + 2340254613.

It is an arithmetic number, because the mean of its divisors is an integer number (5029197931233).

Almost surely, 2^{20112111220001} is an apocalyptic number.

It is an amenable number.

20112111220001 is a deficient number, since it is larger than the sum of its proper divisors (4680504931).

20112111220001 is an equidigital number, since it uses as much as digits as its factorization.

20112111220001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4680504930.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 20112111220001 its reverse (10002211121102), we get a palindrome (30114322341103).

The spelling of 20112111220001 in words is "twenty trillion, one hundred twelve billion, one hundred eleven million, two hundred twenty thousand, one".