21110121223123 has 16 divisors (see below), whose sum is σ = 21284149478400. Its totient is φ = 20936543203296.

The previous prime is 21110121223099. The next prime is 21110121223151. The reversal of 21110121223123 is 32132212101112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21110121223123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110121223094 and 21110121223103.

It is not an unprimeable number, because it can be changed into a prime (21110121523123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 349805290 + ... + 349865632.

It is an arithmetic number, because the mean of its divisors is an integer number (1330259342400).

Almost surely, 2^{21110121223123} is an apocalyptic number.

21110121223123 is a deficient number, since it is larger than the sum of its proper divisors (174028255277).

21110121223123 is a wasteful number, since it uses less digits than its factorization.

21110121223123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64026.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21110121223123 its reverse (32132212101112), we get a palindrome (53242333324235).

The spelling of 21110121223123 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one million, two hundred twenty-three thousand, one hundred twenty-three".