20001123211 has 12 divisors (see below), whose sum is σ = 20488107088. Its totient is φ = 19525402512.

The previous prime is 20001123161. The next prime is 20001123221. The reversal of 20001123211 is 11232110002.

It is not a de Polignac number, because 20001123211 - 2²³ = 19992734603 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20001123191 and 20001123200.

It is not an unprimeable number, because it can be changed into a prime (20001123221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 865570 + ... + 888376.

Almost surely, 2^20001123211 is an apocalyptic number.

20001123211 is a deficient number, since it is larger than the sum of its proper divisors (486983877).

20001123211 is an equidigital number, since it uses as much as digits as its factorization.

20001123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23298 (or 23251 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20001123211 its reverse (11232110002), we get a palindrome (31233233213).

It can be divided in two parts, 2000 and 1123211, that added together give a palindrome (1125211).

The spelling of 20001123211 in words is "twenty billion, one million, one hundred twenty-three thousand, two hundred eleven".