20001101211211 has 4 divisors (see below), whose sum is σ = 20001326717800. Its totient is φ = 20000875704624.

The previous prime is 20001101211209. The next prime is 20001101211233. The reversal of 20001101211211 is 11211210110002.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 20001101211211 - 2¹ = 20001101211209 is a prime.

It is a super-2 number, since 2×20001101211211² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001101211191 and 20001101211200.

It is not an unprimeable number, because it can be changed into a prime (20001101211271) 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, 112620201 + ... + 112797658.

It is an arithmetic number, because the mean of its divisors is an integer number (5000331679450).

Almost surely, 2^{20001101211211} is an apocalyptic number.

20001101211211 is a deficient number, since it is larger than the sum of its proper divisors (225506589).

20001101211211 is an equidigital number, since it uses as much as digits as its factorization.

20001101211211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225506588.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 20001101211211 its reverse (11211210110002), we get a palindrome (31212311321213).

The spelling of 20001101211211 in words is "twenty trillion, one billion, one hundred one million, two hundred eleven thousand, two hundred eleven".