21302423423 has 8 divisors (see below), whose sum is σ = 21899116176. Its totient is φ = 20709403200.

The previous prime is 21302423411. The next prime is 21302423447. The reversal of 21302423423 is 32432420312.

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 21302423423 - 2²⁸ = 21033987967 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302423392 and 21302423401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302423453) 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, 906368 + ... + 929573.

It is an arithmetic number, because the mean of its divisors is an integer number (2737389522).

Almost surely, 2^21302423423 is an apocalyptic number.

21302423423 is a deficient number, since it is larger than the sum of its proper divisors (596692753).

21302423423 is a wasteful number, since it uses less digits than its factorization.

21302423423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836265.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21302423423 its reverse (32432420312), we get a palindrome (53734843735).

The spelling of 21302423423 in words is "twenty-one billion, three hundred two million, four hundred twenty-three thousand, four hundred twenty-three".