21112132313123 has 4 divisors (see below), whose sum is σ = 21112201138440. Its totient is φ = 21112063487808.

The previous prime is 21112132313117. The next prime is 21112132313159. The reversal of 21112132313123 is 32131323121112.

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 21112132313123 - 2³⁰ = 21111058571299 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21112132313092 and 21112132313101.

It is not an unprimeable number, because it can be changed into a prime (21112132313113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33950465 + ... + 34566722.

It is an arithmetic number, because the mean of its divisors is an integer number (5278050284610).

Almost surely, 2^{21112132313123} is an apocalyptic number.

21112132313123 is a deficient number, since it is larger than the sum of its proper divisors (68825317).

21112132313123 is an equidigital number, since it uses as much as digits as its factorization.

21112132313123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 68825316.

The product of its digits is 1296, while the sum is 26.

Adding to 21112132313123 its reverse (32131323121112), we get a palindrome (53243455434235).

The spelling of 21112132313123 in words is "twenty-one trillion, one hundred twelve billion, one hundred thirty-two million, three hundred thirteen thousand, one hundred twenty-three".