21323251423 has 8 divisors (see below), whose sum is σ = 21873741120. Its totient is φ = 20774209920.

The previous prime is 21323251421. The next prime is 21323251463. The reversal of 21323251423 is 32415232312.

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 21323251423 - 2¹ = 21323251421 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21323251391 and 21323251400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21323251421) 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, 332190 + ... + 391147.

It is an arithmetic number, because the mean of its divisors is an integer number (2734217640).

Almost surely, 2^21323251423 is an apocalyptic number.

21323251423 is a deficient number, since it is larger than the sum of its proper divisors (550489697).

21323251423 is an equidigital number, since it uses as much as digits as its factorization.

21323251423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724097.

The product of its digits is 8640, while the sum is 28.

Adding to 21323251423 its reverse (32415232312), we get a palindrome (53738483735).

The spelling of 21323251423 in words is "twenty-one billion, three hundred twenty-three million, two hundred fifty-one thousand, four hundred twenty-three".