20211110123 has 4 divisors (see below), whose sum is σ = 20466947040. Its totient is φ = 19955273208.

The previous prime is 20211110119. The next prime is 20211110147. The reversal of 20211110123 is 32101111202.

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 20211110123 - 2² = 20211110119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211110098 and 20211110107.

It is not an unprimeable number, because it can be changed into a prime (20211110173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127918340 + ... + 127918497.

It is an arithmetic number, because the mean of its divisors is an integer number (5116736760).

Almost surely, 2^20211110123 is an apocalyptic number.

20211110123 is a deficient number, since it is larger than the sum of its proper divisors (255836917).

20211110123 is an equidigital number, since it uses as much as digits as its factorization.

20211110123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255836916.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 20211110123 its reverse (32101111202), we get a palindrome (52312221325).

The spelling of 20211110123 in words is "twenty billion, two hundred eleven million, one hundred ten thousand, one hundred twenty-three".