21201110110321 has 2 divisors, whose sum is σ = 21201110110322. Its totient is φ = 21201110110320.

The previous prime is 21201110110309. The next prime is 21201110110337. The reversal of 21201110110321 is 12301101110212.

It is a happy number.

It is an a-pointer prime, because the next prime (21201110110337) can be obtained adding 21201110110321 to its sum of digits (16).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19316156850225 + 1884953260096 = 4395015^2 + 1372936^2 .

It is a cyclic number.

It is not a de Polignac number, because 21201110110321 - 2²⁵ = 21201076555889 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21201110110295 and 21201110110304.

It is not a weakly prime, because it can be changed into another prime (21201110110121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10600555055160 + 10600555055161.

It is an arithmetic number, because the mean of its divisors is an integer number (10600555055161).

Almost surely, 2^{21201110110321} is an apocalyptic number.

It is an amenable number.

21201110110321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21201110110321 is an equidigital number, since it uses as much as digits as its factorization.

21201110110321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 16.

Adding to 21201110110321 its reverse (12301101110212), we get a palindrome (33502211220533).

The spelling of 21201110110321 in words is "twenty-one trillion, two hundred one billion, one hundred ten million, one hundred ten thousand, three hundred twenty-one".