20321244420221 has 4 divisors (see below), whose sum is σ = 20445914631552. Its totient is φ = 20196574208892.

The previous prime is 20321244420203. The next prime is 20321244420223. The reversal of 20321244420221 is 12202444212302.

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 a de Polignac number, because none of the positive numbers 2^k-20321244420221 is a prime.

It is a super-3 number, since 3×20321244420221³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20321244420223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 62335105421 + ... + 62335105746.

It is an arithmetic number, because the mean of its divisors is an integer number (5111478657888).

Almost surely, 2^{20321244420221} is an apocalyptic number.

It is an amenable number.

20321244420221 is a deficient number, since it is larger than the sum of its proper divisors (124670211331).

20321244420221 is a wasteful number, since it uses less digits than its factorization.

20321244420221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124670211330.

The product of its (nonzero) digits is 12288, while the sum is 29.

Adding to 20321244420221 its reverse (12202444212302), we get a palindrome (32523688632523).

The spelling of 20321244420221 in words is "twenty trillion, three hundred twenty-one billion, two hundred forty-four million, four hundred twenty thousand, two hundred twenty-one".