21210323323123 has 8 divisors (see below), whose sum is σ = 23464429387776. Its totient is φ = 19010533067400.

The previous prime is 21210323323121. The next prime is 21210323323129. The reversal of 21210323323123 is 32132332301212.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21210323323123 - 2¹ = 21210323323121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21210323323091 and 21210323323100.

It is not an unprimeable number, because it can be changed into a prime (21210323323121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13578951411 + ... + 13578952972.

It is an arithmetic number, because the mean of its divisors is an integer number (2933053673472).

Almost surely, 2^{21210323323123} is an apocalyptic number.

21210323323123 is a deficient number, since it is larger than the sum of its proper divisors (2254106064653).

21210323323123 is a wasteful number, since it uses less digits than its factorization.

21210323323123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27157904465.

The product of its (nonzero) digits is 7776, while the sum is 28.

Adding to 21210323323123 its reverse (32132332301212), we get a palindrome (53342655624335).

The spelling of 21210323323123 in words is "twenty-one trillion, two hundred ten billion, three hundred twenty-three million, three hundred twenty-three thousand, one hundred twenty-three".