21572308193 has 2 divisors, whose sum is σ = 21572308194. Its totient is φ = 21572308192.

The previous prime is 21572308159. The next prime is 21572308223. The reversal of 21572308193 is 39180327512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21395497984 + 176810209 = 146272^2 + 13297^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21572308193 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21572308193.

It is not a weakly prime, because it can be changed into another prime (21572308133) 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, 10786154096 + 10786154097.

It is an arithmetic number, because the mean of its divisors is an integer number (10786154097).

Almost surely, 2^21572308193 is an apocalyptic number.

It is an amenable number.

21572308193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21572308193 is an equidigital number, since it uses as much as digits as its factorization.

21572308193 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 90720, while the sum is 41.

The spelling of 21572308193 in words is "twenty-one billion, five hundred seventy-two million, three hundred eight thousand, one hundred ninety-three".