21310213321 has 2 divisors, whose sum is σ = 21310213322. Its totient is φ = 21310213320.

The previous prime is 21310213313. The next prime is 21310213333. The reversal of 21310213321 is 12331201312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12334545721 + 8975667600 = 111061^2 + 94740^2 .

It is a cyclic number.

It is not a de Polignac number, because 21310213321 - 2³ = 21310213313 is a prime.

It is not a weakly prime, because it can be changed into another prime (21310213721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655106660 + 10655106661.

It is an arithmetic number, because the mean of its divisors is an integer number (10655106661).

Almost surely, 2^21310213321 is an apocalyptic number.

It is an amenable number.

21310213321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21310213321 is an equidigital number, since it uses as much as digits as its factorization.

21310213321 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 19.

Adding to 21310213321 its reverse (12331201312), we get a palindrome (33641414633).

The spelling of 21310213321 in words is "twenty-one billion, three hundred ten million, two hundred thirteen thousand, three hundred twenty-one".