21010310231321 has 2 divisors, whose sum is σ = 21010310231322. Its totient is φ = 21010310231320.

The previous prime is 21010310231203. The next prime is 21010310231327. The reversal of 21010310231321 is 12313201301012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20967653112025 + 42657119296 = 4579045^2 + 206536^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21010310231321 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21010310231293 and 21010310231302.

It is not a weakly prime, because it can be changed into another prime (21010310231327) 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, 10505155115660 + 10505155115661.

It is an arithmetic number, because the mean of its divisors is an integer number (10505155115661).

Almost surely, 2^{21010310231321} is an apocalyptic number.

It is an amenable number.

21010310231321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010310231321 is an equidigital number, since it uses as much as digits as its factorization.

21010310231321 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21010310231321 its reverse (12313201301012), we get a palindrome (33323511532333).

The spelling of 21010310231321 in words is "twenty-one trillion, ten billion, three hundred ten million, two hundred thirty-one thousand, three hundred twenty-one".