21241654193 has 2 divisors, whose sum is σ = 21241654194. Its totient is φ = 21241654192.

The previous prime is 21241654177. The next prime is 21241654249. The reversal of 21241654193 is 39145614212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19536211984 + 1705442209 = 139772^2 + 41297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21241654193 - 2⁴ = 21241654177 is a prime.

It is not a weakly prime, because it can be changed into another prime (21241654153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620827096 + 10620827097.

It is an arithmetic number, because the mean of its divisors is an integer number (10620827097).

Almost surely, 2^21241654193 is an apocalyptic number.

It is an amenable number.

21241654193 is a deficient number, since it is larger than the sum of its proper divisors (1).

21241654193 is an equidigital number, since it uses as much as digits as its factorization.

21241654193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 51840, while the sum is 38.

The spelling of 21241654193 in words is "twenty-one billion, two hundred forty-one million, six hundred fifty-four thousand, one hundred ninety-three".