21323330430481 has 2 divisors, whose sum is σ = 21323330430482. Its totient is φ = 21323330430480.

The previous prime is 21323330430421. The next prime is 21323330430503. The reversal of 21323330430481 is 18403403332312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18279558211600 + 3043772218881 = 4275460^2 + 1744641^2 .

It is a cyclic number.

It is not a de Polignac number, because 21323330430481 - 2¹⁷ = 21323330299409 is a prime.

It is a super-2 number, since 2×21323330430481² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21323330430481.

It is not a weakly prime, because it can be changed into another prime (21323330430421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10661665215240 + 10661665215241.

It is an arithmetic number, because the mean of its divisors is an integer number (10661665215241).

Almost surely, 2^{21323330430481} is an apocalyptic number.

It is an amenable number.

21323330430481 is a deficient number, since it is larger than the sum of its proper divisors (1).

21323330430481 is an equidigital number, since it uses as much as digits as its factorization.

21323330430481 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 124416, while the sum is 37.

Adding to 21323330430481 its reverse (18403403332312), we get a palindrome (39726733762793).

The spelling of 21323330430481 in words is "twenty-one trillion, three hundred twenty-three billion, three hundred thirty million, four hundred thirty thousand, four hundred eighty-one".