21320430423 has 16 divisors (see below), whose sum is σ = 29936380800. Its totient is φ = 13459698720.

The previous prime is 21320430407. The next prime is 21320430431. The reversal of 21320430423 is 32403402312.

It is not a de Polignac number, because 21320430423 - 2⁴ = 21320430407 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320430393 and 21320430402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21320430023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53548 + ... + 213326.

It is an arithmetic number, because the mean of its divisors is an integer number (1871023800).

Almost surely, 2^21320430423 is an apocalyptic number.

21320430423 is a deficient number, since it is larger than the sum of its proper divisors (8615950377).

21320430423 is a wasteful number, since it uses less digits than its factorization.

21320430423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162142.

The product of its (nonzero) digits is 3456, while the sum is 24.

Adding to 21320430423 its reverse (32403402312), we get a palindrome (53723832735).

The spelling of 21320430423 in words is "twenty-one billion, three hundred twenty million, four hundred thirty thousand, four hundred twenty-three".