21031303230221 has 2 divisors, whose sum is σ = 21031303230222. Its totient is φ = 21031303230220.

The previous prime is 21031303230199. The next prime is 21031303230257. The reversal of 21031303230221 is 12203230313012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14887790740900 + 6143512489321 = 3858470^2 + 2478611^2 .

It is a cyclic number.

It is not a de Polignac number, because 21031303230221 - 2¹⁰ = 21031303229197 is a prime.

It is a super-3 number, since 3×21031303230221³ (a number of 41 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030303230221) 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 as a sum of consecutive naturals, namely, 10515651615110 + 10515651615111.

It is an arithmetic number, because the mean of its divisors is an integer number (10515651615111).

Almost surely, 2^{21031303230221} is an apocalyptic number.

It is an amenable number.

21031303230221 is a deficient number, since it is larger than the sum of its proper divisors (1).

21031303230221 is an equidigital number, since it uses as much as digits as its factorization.

21031303230221 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 21031303230221 its reverse (12203230313012), we get a palindrome (33234533543233).

The spelling of 21031303230221 in words is "twenty-one trillion, thirty-one billion, three hundred three million, two hundred thirty thousand, two hundred twenty-one".