21332202321 has 4 divisors (see below), whose sum is σ = 28442936432. Its totient is φ = 14221468212.

The previous prime is 21332202301. The next prime is 21332202337. The reversal of 21332202321 is 12320223312.

It is a happy number.

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 21332202321 - 2⁵ = 21332202289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21332202301) 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, 3555367051 + ... + 3555367056.

It is an arithmetic number, because the mean of its divisors is an integer number (7110734108).

Almost surely, 2^21332202321 is an apocalyptic number.

It is an amenable number.

21332202321 is a deficient number, since it is larger than the sum of its proper divisors (7110734111).

21332202321 is an equidigital number, since it uses as much as digits as its factorization.

21332202321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7110734110.

The product of its (nonzero) digits is 864, while the sum is 21.

Adding to 21332202321 its reverse (12320223312), we get a palindrome (33652425633).

The spelling of 21332202321 in words is "twenty-one billion, three hundred thirty-two million, two hundred two thousand, three hundred twenty-one".