20111111323 has 4 divisors (see below), whose sum is σ = 20111418880. Its totient is φ = 20110803768.

The previous prime is 20111111311. The next prime is 20111111329. The reversal of 20111111323 is 32311111102.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32311111102 = 2 ⋅16155555551.

It is a cyclic number.

It is not a de Polignac number, because 20111111323 - 2¹⁷ = 20110980251 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20111111297 and 20111111306.

It is not an unprimeable number, because it can be changed into a prime (20111111329) 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, 12315 + ... + 200932.

It is an arithmetic number, because the mean of its divisors is an integer number (5027854720).

Almost surely, 2^20111111323 is an apocalyptic number.

20111111323 is a deficient number, since it is larger than the sum of its proper divisors (307557).

20111111323 is an equidigital number, since it uses as much as digits as its factorization.

20111111323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307556.

The product of its (nonzero) digits is 36, while the sum is 16.

Adding to 20111111323 its reverse (32311111102), we get a palindrome (52422222425).

The spelling of 20111111323 in words is "twenty billion, one hundred eleven million, one hundred eleven thousand, three hundred twenty-three".