21301322321 has 2 divisors, whose sum is σ = 21301322322. Its totient is φ = 21301322320.

The previous prime is 21301322293. The next prime is 21301322333. The reversal of 21301322321 is 12322310312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20782393921 + 518928400 = 144161^2 + 22780^2 .

It is a cyclic number.

It is not a de Polignac number, because 21301322321 - 2⁶ = 21301322257 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21301322293 and 21301322302.

It is not a weakly prime, because it can be changed into another prime (21301322381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10650661160 + 10650661161.

It is an arithmetic number, because the mean of its divisors is an integer number (10650661161).

Almost surely, 2^21301322321 is an apocalyptic number.

It is an amenable number.

21301322321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21301322321 is an equidigital number, since it uses as much as digits as its factorization.

21301322321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 21301322321 its reverse (12322310312), we get a palindrome (33623632633).

The spelling of 21301322321 in words is "twenty-one billion, three hundred one million, three hundred twenty-two thousand, three hundred twenty-one".