21302323221 has 8 divisors (see below), whose sum is σ = 28403799424. Its totient is φ = 14201197920.

The previous prime is 21302323187. The next prime is 21302323243. The reversal of 21302323221 is 12232320312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21302323221 - 2²⁵ = 21268768789 is a prime.

It is a super-2 number, since 2×21302323221² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302323261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133956 + ... + 246066.

It is an arithmetic number, because the mean of its divisors is an integer number (3550474928).

Almost surely, 2^21302323221 is an apocalyptic number.

It is an amenable number.

21302323221 is a deficient number, since it is larger than the sum of its proper divisors (7101476203).

21302323221 is a wasteful number, since it uses less digits than its factorization.

21302323221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175451.

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

Adding to 21302323221 its reverse (12232320312), we get a palindrome (33534643533).

The spelling of 21302323221 in words is "twenty-one billion, three hundred two million, three hundred twenty-three thousand, two hundred twenty-one".