21330232130321 has 2 divisors, whose sum is σ = 21330232130322. Its totient is φ = 21330232130320.

The previous prime is 21330232130279. The next prime is 21330232130351. The reversal of 21330232130321 is 12303123203312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13933795840000 + 7396436290321 = 3732800^2 + 2719639^2 .

It is a cyclic number.

It is not a de Polignac number, because 21330232130321 - 2¹⁴ = 21330232113937 is a prime.

It is not a weakly prime, because it can be changed into another prime (21330232130351) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665116065160 + 10665116065161.

It is an arithmetic number, because the mean of its divisors is an integer number (10665116065161).

Almost surely, 2^{21330232130321} is an apocalyptic number.

It is an amenable number.

21330232130321 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330232130321 is an equidigital number, since it uses as much as digits as its factorization.

21330232130321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 26.

Adding to 21330232130321 its reverse (12303123203312), we get a palindrome (33633355333633).

The spelling of 21330232130321 in words is "twenty-one trillion, three hundred thirty billion, two hundred thirty-two million, one hundred thirty thousand, three hundred twenty-one".