20123320211 has 4 divisors (see below), whose sum is σ = 20503005552. Its totient is φ = 19743634872.

The previous prime is 20123320207. The next prime is 20123320219. The reversal of 20123320211 is 11202332102.

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 20123320211 - 2² = 20123320207 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 20123320211.

It is not an unprimeable number, because it can be changed into a prime (20123320219) 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, 189842591 + ... + 189842696.

It is an arithmetic number, because the mean of its divisors is an integer number (5125751388).

Almost surely, 2^20123320211 is an apocalyptic number.

20123320211 is a deficient number, since it is larger than the sum of its proper divisors (379685341).

20123320211 is an equidigital number, since it uses as much as digits as its factorization.

20123320211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379685340.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 20123320211 its reverse (11202332102), we get a palindrome (31325652313).

The spelling of 20123320211 in words is "twenty billion, one hundred twenty-three million, three hundred twenty thousand, two hundred eleven".