21130324393 has 2 divisors, whose sum is σ = 21130324394. Its totient is φ = 21130324392.

The previous prime is 21130324381. The next prime is 21130324409. The reversal of 21130324393 is 39342303112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21063297424 + 67026969 = 145132^2 + 8187^2 .

It is a cyclic number.

It is not a de Polignac number, because 21130324393 - 2¹⁷ = 21130193321 is a prime.

It is not a weakly prime, because it can be changed into another prime (21130324333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10565162196 + 10565162197.

It is an arithmetic number, because the mean of its divisors is an integer number (10565162197).

Almost surely, 2^21130324393 is an apocalyptic number.

It is an amenable number.

21130324393 is a deficient number, since it is larger than the sum of its proper divisors (1).

21130324393 is an equidigital number, since it uses as much as digits as its factorization.

21130324393 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 31.

The spelling of 21130324393 in words is "twenty-one billion, one hundred thirty million, three hundred twenty-four thousand, three hundred ninety-three".