21403230193 has 2 divisors, whose sum is σ = 21403230194. Its totient is φ = 21403230192.

The previous prime is 21403230187. The next prime is 21403230203. The reversal of 21403230193 is 39103230412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12645452304 + 8757777889 = 112452^2 + 93583^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21403230193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21403231193) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701615096 + 10701615097.

It is an arithmetic number, because the mean of its divisors is an integer number (10701615097).

Almost surely, 2^21403230193 is an apocalyptic number.

It is an amenable number.

21403230193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403230193 is an equidigital number, since it uses as much as digits as its factorization.

21403230193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3888, while the sum is 28.

The spelling of 21403230193 in words is "twenty-one billion, four hundred three million, two hundred thirty thousand, one hundred ninety-three".