21324232321 has 8 divisors (see below), whose sum is σ = 24377644800. Its totient is φ = 18272593248.

The previous prime is 21324232309. The next prime is 21324232333. The reversal of 21324232321 is 12323242312.

It is an interprime number because it is at equal distance from previous prime (21324232309) and next prime (21324232333).

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

It is not a de Polignac number, because 21324232321 - 2²¹ = 21322135169 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21324232301) 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, 417481 + ... + 465766.

It is an arithmetic number, because the mean of its divisors is an integer number (3047205600).

Almost surely, 2^21324232321 is an apocalyptic number.

It is an amenable number.

21324232321 is a deficient number, since it is larger than the sum of its proper divisors (3053412479).

21324232321 is an equidigital number, since it uses as much as digits as its factorization.

21324232321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 886703.

The product of its digits is 3456, while the sum is 25.

Adding to 21324232321 its reverse (12323242312), we get a palindrome (33647474633).

Subtracting from 21324232321 its reverse (12323242312), we obtain a palindrome (9000990009).

The spelling of 21324232321 in words is "twenty-one billion, three hundred twenty-four million, two hundred thirty-two thousand, three hundred twenty-one".