30121311217 has 2 divisors, whose sum is σ = 30121311218. Its totient is φ = 30121311216.

The previous prime is 30121311139. The next prime is 30121311239. The reversal of 30121311217 is 71211312103.

It is an a-pointer prime, because the next prime (30121311239) can be obtained adding 30121311217 to its sum of digits (22).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 29221851136 + 899460081 = 170944^2 + 29991^2 .

It is an emirp because it is prime and its reverse (71211312103) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 30121311217 - 2¹⁵ = 30121278449 is a prime.

It is not a weakly prime, because it can be changed into another prime (30121311317) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15060655608 + 15060655609.

It is an arithmetic number, because the mean of its divisors is an integer number (15060655609).

Almost surely, 2^30121311217 is an apocalyptic number.

It is an amenable number.

30121311217 is a deficient number, since it is larger than the sum of its proper divisors (1).

30121311217 is an equidigital number, since it uses as much as digits as its factorization.

30121311217 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 252, while the sum is 22.

The spelling of 30121311217 in words is "thirty billion, one hundred twenty-one million, three hundred eleven thousand, two hundred seventeen".