30421688917 has 2 divisors, whose sum is σ = 30421688918. Its totient is φ = 30421688916.

The previous prime is 30421688911. The next prime is 30421688951. The reversal of 30421688917 is 71988612403.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29238948036 + 1182740881 = 170994^2 + 34391^2 .

It is a cyclic number.

It is not a de Polignac number, because 30421688917 - 2⁷ = 30421688789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (30421688911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15210844458 + 15210844459.

It is an arithmetic number, because the mean of its divisors is an integer number (15210844459).

Almost surely, 2^30421688917 is an apocalyptic number.

It is an amenable number.

30421688917 is a deficient number, since it is larger than the sum of its proper divisors (1).

30421688917 is an equidigital number, since it uses as much as digits as its factorization.

30421688917 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 580608, while the sum is 49.

The spelling of 30421688917 in words is "thirty billion, four hundred twenty-one million, six hundred eighty-eight thousand, nine hundred seventeen".