21163316150609 has 2 divisors, whose sum is σ = 21163316150610. Its totient is φ = 21163316150608.

The previous prime is 21163316150597. The next prime is 21163316150633. The reversal of 21163316150609 is 90605161336112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19493284614400 + 1670031536209 = 4415120^2 + 1292297^2 .

It is a cyclic number.

It is not a de Polignac number, because 21163316150609 - 2²⁴ = 21163299373393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21163316150609.

It is not a weakly prime, because it can be changed into another prime (21163316150699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10581658075304 + 10581658075305.

It is an arithmetic number, because the mean of its divisors is an integer number (10581658075305).

Almost surely, 2^{21163316150609} is an apocalyptic number.

It is an amenable number.

21163316150609 is a deficient number, since it is larger than the sum of its proper divisors (1).

21163316150609 is an equidigital number, since it uses as much as digits as its factorization.

21163316150609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 44.

The spelling of 21163316150609 in words is "twenty-one trillion, one hundred sixty-three billion, three hundred sixteen million, one hundred fifty thousand, six hundred nine".