21830797493 has 2 divisors, whose sum is σ = 21830797494. Its totient is φ = 21830797492.

The previous prime is 21830797477. The next prime is 21830797529. The reversal of 21830797493 is 39479703812.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13619356804 + 8211440689 = 116702^2 + 90617^2 .

It is a cyclic number.

It is not a de Polignac number, because 21830797493 - 2⁴ = 21830797477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21830797453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10915398746 + 10915398747.

It is an arithmetic number, because the mean of its divisors is an integer number (10915398747).

Almost surely, 2^21830797493 is an apocalyptic number.

It is an amenable number.

21830797493 is a deficient number, since it is larger than the sum of its proper divisors (1).

21830797493 is an equidigital number, since it uses as much as digits as its factorization.

21830797493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2286144, while the sum is 53.

The spelling of 21830797493 in words is "twenty-one billion, eight hundred thirty million, seven hundred ninety-seven thousand, four hundred ninety-three".