20121123211 has 16 divisors (see below), whose sum is σ = 24354316224. Its totient is φ = 16228122624.

The previous prime is 20121123203. The next prime is 20121123227. The reversal of 20121123211 is 11232112102.

It is not a de Polignac number, because 20121123211 - 2³ = 20121123203 is a prime.

It is not an unprimeable number, because it can be changed into a prime (20121123241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 515851 + ... + 553483.

It is an arithmetic number, because the mean of its divisors is an integer number (1522144764).

Almost surely, 2^20121123211 is an apocalyptic number.

20121123211 is a deficient number, since it is larger than the sum of its proper divisors (4233193013).

20121123211 is a wasteful number, since it uses less digits than its factorization.

20121123211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42150.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20121123211 its reverse (11232112102), we get a palindrome (31353235313).

It can be divided in two parts, 201211 and 23211, that added together give a palindrome (224422).

The spelling of 20121123211 in words is "twenty billion, one hundred twenty-one million, one hundred twenty-three thousand, two hundred eleven".