21001120193 has 2 divisors, whose sum is σ = 21001120194. Its totient is φ = 21001120192.

The previous prime is 21001120141. The next prime is 21001120243. The reversal of 21001120193 is 39102110012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20976597889 + 24522304 = 144833^2 + 4952^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21001120193 is a prime.

It is not a weakly prime, because it can be changed into another prime (21001120103) 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, 10500560096 + 10500560097.

It is an arithmetic number, because the mean of its divisors is an integer number (10500560097).

Almost surely, 2^21001120193 is an apocalyptic number.

It is an amenable number.

21001120193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001120193 is an equidigital number, since it uses as much as digits as its factorization.

21001120193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 20.

The spelling of 21001120193 in words is "twenty-one billion, one million, one hundred twenty thousand, one hundred ninety-three".