21332144321 has 4 divisors (see below), whose sum is σ = 21589158192. Its totient is φ = 21075130452.

The previous prime is 21332144311. The next prime is 21332144347. The reversal of 21332144321 is 12344123312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21332144321 - 2⁶ = 21332144257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332144311) 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, 128506811 + ... + 128506976.

It is an arithmetic number, because the mean of its divisors is an integer number (5397289548).

Almost surely, 2^21332144321 is an apocalyptic number.

It is an amenable number.

21332144321 is a deficient number, since it is larger than the sum of its proper divisors (257013871).

21332144321 is an equidigital number, since it uses as much as digits as its factorization.

21332144321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 257013870.

The product of its digits is 3456, while the sum is 26.

Adding to 21332144321 its reverse (12344123312), we get a palindrome (33676267633).

The spelling of 21332144321 in words is "twenty-one billion, three hundred thirty-two million, one hundred forty-four thousand, three hundred twenty-one".