21120201110123 has 4 divisors (see below), whose sum is σ = 21139630919040. Its totient is φ = 21100771301208.

The previous prime is 21120201110087. The next prime is 21120201110131. The reversal of 21120201110123 is 32101110202112.

It is a happy number.

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 21120201110123 - 2⁶ = 21120201110059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120201110143) 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, 9714902828 + ... + 9714905001.

It is an arithmetic number, because the mean of its divisors is an integer number (5284907729760).

Almost surely, 2^{21120201110123} is an apocalyptic number.

21120201110123 is a deficient number, since it is larger than the sum of its proper divisors (19429808917).

21120201110123 is a wasteful number, since it uses less digits than its factorization.

21120201110123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19429808916.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21120201110123 its reverse (32101110202112), we get a palindrome (53221311312235).

The spelling of 21120201110123 in words is "twenty-one trillion, one hundred twenty billion, two hundred one million, one hundred ten thousand, one hundred twenty-three".