21321201230221 has 4 divisors (see below), whose sum is σ = 21321320727744. Its totient is φ = 21321081732700.

The previous prime is 21321201230207. The next prime is 21321201230261. The reversal of 21321201230221 is 12203210212312.

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 21321201230221 - 2¹⁵ = 21321201197453 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21321201230192 and 21321201230201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21321201230201) 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, 59480725 + ... + 59838106.

It is an arithmetic number, because the mean of its divisors is an integer number (5330330181936).

Almost surely, 2^{21321201230221} is an apocalyptic number.

It is an amenable number.

21321201230221 is a deficient number, since it is larger than the sum of its proper divisors (119497523).

21321201230221 is a wasteful number, since it uses less digits than its factorization.

21321201230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119497522.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21321201230221 its reverse (12203210212312), we get a palindrome (33524411442533).

The spelling of 21321201230221 in words is "twenty-one trillion, three hundred twenty-one billion, two hundred one million, two hundred thirty thousand, two hundred twenty-one".