20001020210111 has 4 divisors (see below), whose sum is σ = 20001240293112. Its totient is φ = 20000800127112.

The previous prime is 20001020210069. The next prime is 20001020210173. The reversal of 20001020210111 is 11101202010002.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20001020210111 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001020210092 and 20001020210101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001020210191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 109905125 + ... + 110086958.

It is an arithmetic number, because the mean of its divisors is an integer number (5000310073278).

Almost surely, 2^{20001020210111} is an apocalyptic number.

20001020210111 is a deficient number, since it is larger than the sum of its proper divisors (220083001).

20001020210111 is an equidigital number, since it uses as much as digits as its factorization.

20001020210111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220083000.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 20001020210111 its reverse (11101202010002), we get a palindrome (31102222220113).

The spelling of 20001020210111 in words is "twenty trillion, one billion, twenty million, two hundred ten thousand, one hundred eleven".