21323320123 has 8 divisors (see below), whose sum is σ = 24380154848. Its totient is φ = 18269146944.

The previous prime is 21323320111. The next prime is 21323320127. The reversal of 21323320123 is 32102332312.

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 21323320123 - 2²¹ = 21321222971 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21323320094 and 21323320103.

It is not an unprimeable number, because it can be changed into a prime (21323320127) 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, 648186 + ... + 680287.

It is an arithmetic number, because the mean of its divisors is an integer number (3047519356).

Almost surely, 2^21323320123 is an apocalyptic number.

21323320123 is a deficient number, since it is larger than the sum of its proper divisors (3056834725).

21323320123 is a wasteful number, since it uses less digits than its factorization.

21323320123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1330773.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21323320123 its reverse (32102332312), we get a palindrome (53425652435).

The spelling of 21323320123 in words is "twenty-one billion, three hundred twenty-three million, three hundred twenty thousand, one hundred twenty-three".