21001300193 has 2 divisors, whose sum is σ = 21001300194. Its totient is φ = 21001300192.

The previous prime is 21001300189. The next prime is 21001300259. The reversal of 21001300193 is 39100310012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20561265664 + 440034529 = 143392^2 + 20977^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001300193 - 2² = 21001300189 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001300093) 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, 10500650096 + 10500650097.

It is an arithmetic number, because the mean of its divisors is an integer number (10500650097).

Almost surely, 2^21001300193 is an apocalyptic number.

It is an amenable number.

21001300193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001300193 is an equidigital number, since it uses as much as digits as its factorization.

21001300193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162, while the sum is 20.

The spelling of 21001300193 in words is "twenty-one billion, one million, three hundred thousand, one hundred ninety-three".