21423014421 has 8 divisors (see below), whose sum is σ = 28564736640. Its totient is φ = 14281650912.

The previous prime is 21423014413. The next prime is 21423014429. The reversal of 21423014421 is 12441032412.

It is an interprime number because it is at equal distance from previous prime (21423014413) and next prime (21423014429).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21423014421 - 2³ = 21423014413 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21423014391 and 21423014400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21423014429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 119145 + ... + 238833.

It is an arithmetic number, because the mean of its divisors is an integer number (3570592080).

Almost surely, 2^21423014421 is an apocalyptic number.

It is an amenable number.

21423014421 is a deficient number, since it is larger than the sum of its proper divisors (7141722219).

21423014421 is a wasteful number, since it uses less digits than its factorization.

21423014421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179355.

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 21423014421 its reverse (12441032412), we get a palindrome (33864046833).

The spelling of 21423014421 in words is "twenty-one billion, four hundred twenty-three million, fourteen thousand, four hundred twenty-one".