30221805217 has 2 divisors, whose sum is σ = 30221805218. Its totient is φ = 30221805216.

The previous prime is 30221805179. The next prime is 30221805223. The reversal of 30221805217 is 71250812203.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 23975115921 + 6246689296 = 154839^2 + 79036^2 .

It is a cyclic number.

It is not a de Polignac number, because 30221805217 - 2²⁷ = 30087587489 is a prime.

It is not a weakly prime, because it can be changed into another prime (30221805287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15110902608 + 15110902609.

It is an arithmetic number, because the mean of its divisors is an integer number (15110902609).

Almost surely, 2^30221805217 is an apocalyptic number.

It is an amenable number.

30221805217 is a deficient number, since it is larger than the sum of its proper divisors (1).

30221805217 is an equidigital number, since it uses as much as digits as its factorization.

30221805217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6720, while the sum is 31.

The spelling of 30221805217 in words is "thirty billion, two hundred twenty-one million, eight hundred five thousand, two hundred seventeen".