21310323012123 has 16 divisors (see below), whose sum is σ = 28838173290240. Its totient is φ = 13994682124896.

The previous prime is 21310323012119. The next prime is 21310323012149. The reversal of 21310323012123 is 32121032301312.

It is not a de Polignac number, because 21310323012123 - 2² = 21310323012119 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21310323012093 and 21310323012102.

It is not an unprimeable number, because it can be changed into a prime (21310323012113) 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, 18982938 + ... + 20074176.

It is an arithmetic number, because the mean of its divisors is an integer number (1802385830640).

Almost surely, 2^{21310323012123} is an apocalyptic number.

21310323012123 is a deficient number, since it is larger than the sum of its proper divisors (7527850278117).

21310323012123 is a wasteful number, since it uses less digits than its factorization.

21310323012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1188466.

The product of its (nonzero) digits is 1296, while the sum is 24.

Adding to 21310323012123 its reverse (32121032301312), we get a palindrome (53431355313435).

The spelling of 21310323012123 in words is "twenty-one trillion, three hundred ten billion, three hundred twenty-three million, twelve thousand, one hundred twenty-three".