20001122111 has 4 divisors (see below), whose sum is σ = 20001406152. Its totient is φ = 20000838072.

The previous prime is 20001122093. The next prime is 20001122171. The reversal of 20001122111 is 11122110002.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 20001122111 - 2¹⁰ = 20001121087 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001122092 and 20001122101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20001122171) 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, 51536 + ... + 206538.

It is an arithmetic number, because the mean of its divisors is an integer number (5000351538).

Almost surely, 2^20001122111 is an apocalyptic number.

20001122111 is a deficient number, since it is larger than the sum of its proper divisors (284041).

20001122111 is a wasteful number, since it uses less digits than its factorization.

20001122111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284040.

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

Adding to 20001122111 its reverse (11122110002), we get a palindrome (31123232113).

The spelling of 20001122111 in words is "twenty billion, one million, one hundred twenty-two thousand, one hundred eleven".