20001111211 has 8 divisors (see below), whose sum is σ = 20308942080. Its totient is φ = 19695519528.

The previous prime is 20001111173. The next prime is 20001111233. The reversal of 20001111211 is 11211110002.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20001111211 - 2¹³ = 20001103019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20001211211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 541791 + ... + 577528.

It is an arithmetic number, because the mean of its divisors is an integer number (2538617760).

Almost surely, 2^20001111211 is an apocalyptic number.

20001111211 is a deficient number, since it is larger than the sum of its proper divisors (307830869).

20001111211 is a wasteful number, since it uses less digits than its factorization.

20001111211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1119593.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 20001111211 its reverse (11211110002), we get a palindrome (31212221213).

The spelling of 20001111211 in words is "twenty billion, one million, one hundred eleven thousand, two hundred eleven".