21332002321 has 4 divisors (see below), whose sum is σ = 24379431232. Its totient is φ = 18284573412.

The previous prime is 21332002313. The next prime is 21332002337. The reversal of 21332002321 is 12320023312.

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 not a de Polignac number, because 21332002321 - 2³ = 21332002313 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332002361) 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, 1523714445 + ... + 1523714458.

It is an arithmetic number, because the mean of its divisors is an integer number (6094857808).

Almost surely, 2^21332002321 is an apocalyptic number.

It is an amenable number.

21332002321 is a deficient number, since it is larger than the sum of its proper divisors (3047428911).

21332002321 is an equidigital number, since it uses as much as digits as its factorization.

21332002321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3047428910.

The product of its (nonzero) digits is 432, while the sum is 19.

Adding to 21332002321 its reverse (12320023312), we get a palindrome (33652025633).

The spelling of 21332002321 in words is "twenty-one billion, three hundred thirty-two million, two thousand, three hundred twenty-one".