21331203320221 has 8 divisors (see below), whose sum is σ = 21383846066304. Its totient is φ = 21278575160160.

The previous prime is 21331203320209. The next prime is 21331203320239. The reversal of 21331203320221 is 12202330213312.

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 21331203320221 - 2⁷ = 21331203320093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21331203320281) 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, 715111 + ... + 6570676.

It is an arithmetic number, because the mean of its divisors is an integer number (2672980758288).

Almost surely, 2^{21331203320221} is an apocalyptic number.

It is an amenable number.

21331203320221 is a deficient number, since it is larger than the sum of its proper divisors (52642746083).

21331203320221 is an equidigital number, since it uses as much as digits as its factorization.

21331203320221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7293011.

The product of its (nonzero) digits is 2592, while the sum is 25.

Adding to 21331203320221 its reverse (12202330213312), we get a palindrome (33533533533533).

The spelling of 21331203320221 in words is "twenty-one trillion, three hundred thirty-one billion, two hundred three million, three hundred twenty thousand, two hundred twenty-one".