21321203323123 has 8 divisors (see below), whose sum is σ = 23260628228976. Its totient is φ = 19381967366400.

The previous prime is 21321203323087. The next prime is 21321203323223. The reversal of 21321203323123 is 32132330212312.

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 a de Polignac number, because none of the positive numbers 2^k-21321203323123 is a prime.

It is a super-2 number, since 2×21321203323123² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321203323091 and 21321203323100.

It is not an unprimeable number, because it can be changed into a prime (21321203323223) 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 7 ways as a sum of consecutive naturals, for example, 47001286 + ... + 47452747.

It is an arithmetic number, because the mean of its divisors is an integer number (2907578528622).

Almost surely, 2^{21321203323123} is an apocalyptic number.

21321203323123 is a deficient number, since it is larger than the sum of its proper divisors (1939424905853).

21321203323123 is a wasteful number, since it uses less digits than its factorization.

21321203323123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94474565.

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

Adding to 21321203323123 its reverse (32132330212312), we get a palindrome (53453533535435).

The spelling of 21321203323123 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred three million, three hundred twenty-three thousand, one hundred twenty-three".