21342323144221 has 4 divisors (see below), whose sum is σ = 22270250237472. Its totient is φ = 20414396050972.

The previous prime is 21342323144203. The next prime is 21342323144287. The reversal of 21342323144221 is 12244132324312.

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 21342323144221 - 2⁹ = 21342323143709 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 (21342323144201) 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, 463963546591 + ... + 463963546636.

It is an arithmetic number, because the mean of its divisors is an integer number (5567562559368).

Almost surely, 2^{21342323144221} is an apocalyptic number.

It is an amenable number.

21342323144221 is a deficient number, since it is larger than the sum of its proper divisors (927927093251).

21342323144221 is an equidigital number, since it uses as much as digits as its factorization.

21342323144221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 927927093250.

The product of its digits is 55296, while the sum is 34.

Adding to 21342323144221 its reverse (12244132324312), we get a palindrome (33586455468533).

The spelling of 21342323144221 in words is "twenty-one trillion, three hundred forty-two billion, three hundred twenty-three million, one hundred forty-four thousand, two hundred twenty-one".