17894948021 has 2 divisors, whose sum is σ = 17894948022. Its totient is φ = 17894948020.

The previous prime is 17894947981. The next prime is 17894948023. The reversal of 17894948021 is 12084949871.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9438122500 + 8456825521 = 97150^2 + 91961^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17894948021 is a prime.

Together with 17894948023, 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 (17894948023) 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, 8947474010 + 8947474011.

It is an arithmetic number, because the mean of its divisors is an integer number (8947474011).

Almost surely, 2^17894948021 is an apocalyptic number.

It is an amenable number.

17894948021 is a deficient number, since it is larger than the sum of its proper divisors (1).

17894948021 is an equidigital number, since it uses as much as digits as its factorization.

17894948021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 17894948021 in words is "seventeen billion, eight hundred ninety-four million, nine hundred forty-eight thousand, twenty-one".