21441322321 has 8 divisors (see below), whose sum is σ = 21967190784. Its totient is φ = 20915592480.

The previous prime is 21441322319. The next prime is 21441322327. The reversal of 21441322321 is 12322314412.

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 21441322321 - 2¹ = 21441322319 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21441322327) 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, 323220 + ... + 383866.

It is an arithmetic number, because the mean of its divisors is an integer number (2745898848).

Almost surely, 2^21441322321 is an apocalyptic number.

It is an amenable number.

21441322321 is a deficient number, since it is larger than the sum of its proper divisors (525868463).

21441322321 is an equidigital number, since it uses as much as digits as its factorization.

21441322321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69311.

The product of its digits is 2304, while the sum is 25.

Adding to 21441322321 its reverse (12322314412), we get a palindrome (33763636733).

The spelling of 21441322321 in words is "twenty-one billion, four hundred forty-one million, three hundred twenty-two thousand, three hundred twenty-one".