21323303210123 has 4 divisors (see below), whose sum is σ = 21478947759240. Its totient is φ = 21167658661008.

The previous prime is 21323303210101. The next prime is 21323303210171. The reversal of 21323303210123 is 32101230332312.

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 21323303210123 - 2¹⁰ = 21323303209099 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323303210092 and 21323303210101.

It is not an unprimeable number, because it can be changed into a prime (21323303210173) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77822274353 + ... + 77822274626.

It is an arithmetic number, because the mean of its divisors is an integer number (5369736939810).

Almost surely, 2^{21323303210123} is an apocalyptic number.

21323303210123 is a deficient number, since it is larger than the sum of its proper divisors (155644549117).

21323303210123 is a wasteful number, since it uses less digits than its factorization.

21323303210123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155644549116.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21323303210123 its reverse (32101230332312), we get a palindrome (53424533542435).

The spelling of 21323303210123 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred three million, two hundred ten thousand, one hundred twenty-three".