17750047421 has 2 divisors, whose sum is σ = 17750047422. Its totient is φ = 17750047420.

The previous prime is 17750047397. The next prime is 17750047423. The reversal of 17750047421 is 12474005771.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17300140900 + 449906521 = 131530^2 + 21211^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17750047421 is a prime.

Together with 17750047423, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (17750047423) 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, 8875023710 + 8875023711.

It is an arithmetic number, because the mean of its divisors is an integer number (8875023711).

Almost surely, 2^17750047421 is an apocalyptic number.

It is an amenable number.

17750047421 is a deficient number, since it is larger than the sum of its proper divisors (1).

17750047421 is an equidigital number, since it uses as much as digits as its factorization.

17750047421 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54880, while the sum is 38.

The spelling of 17750047421 in words is "seventeen billion, seven hundred fifty million, forty-seven thousand, four hundred twenty-one".