21422423321 has 4 divisors (see below), whose sum is σ = 23070302052. Its totient is φ = 19774544592.

The previous prime is 21422423317. The next prime is 21422423329. The reversal of 21422423321 is 12332422412.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2805185296 + 18617238025 = 52964^2 + 136445^2 .

It is a cyclic number.

It is not a de Polignac number, because 21422423321 - 2² = 21422423317 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21422423329) 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, 823939346 + ... + 823939371.

It is an arithmetic number, because the mean of its divisors is an integer number (5767575513).

Almost surely, 2^21422423321 is an apocalyptic number.

It is an amenable number.

21422423321 is a deficient number, since it is larger than the sum of its proper divisors (1647878731).

21422423321 is a wasteful number, since it uses less digits than its factorization.

21422423321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647878730.

The product of its digits is 4608, while the sum is 26.

Adding to 21422423321 its reverse (12332422412), we get a palindrome (33754845733).

Subtracting from 21422423321 its reverse (12332422412), we obtain a palindrome (9090000909).

The spelling of 21422423321 in words is "twenty-one billion, four hundred twenty-two million, four hundred twenty-three thousand, three hundred twenty-one".