20001012210111 has 4 divisors (see below), whose sum is σ = 26668016280152. Its totient is φ = 13334008140072.

The previous prime is 20001012210107. The next prime is 20001012210181. The reversal of 20001012210111 is 11101221010002.

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

It is not a de Polignac number, because 20001012210111 - 2² = 20001012210107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001012210181) 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, 3333502035016 + ... + 3333502035021.

It is an arithmetic number, because the mean of its divisors is an integer number (6667004070038).

Almost surely, 2^{20001012210111} is an apocalyptic number.

20001012210111 is a deficient number, since it is larger than the sum of its proper divisors (6667004070041).

20001012210111 is an equidigital number, since it uses as much as digits as its factorization.

20001012210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6667004070040.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 20001012210111 its reverse (11101221010002), we get a palindrome (31102233220113).

The spelling of 20001012210111 in words is "twenty trillion, one billion, twelve million, two hundred ten thousand, one hundred eleven".