17921000401 has 2 divisors, whose sum is σ = 17921000402. Its totient is φ = 17921000400.

The previous prime is 17921000389. The next prime is 17921000417. The reversal of 17921000401 is 10400012971.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15800490000 + 2120510401 = 125700^2 + 46049^2 .

It is a cyclic number.

It is not a de Polignac number, because 17921000401 - 2¹¹ = 17920998353 is a prime.

It is not a weakly prime, because it can be changed into another prime (17921000441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8960500200 + 8960500201.

It is an arithmetic number, because the mean of its divisors is an integer number (8960500201).

Almost surely, 2^17921000401 is an apocalyptic number.

It is an amenable number.

17921000401 is a deficient number, since it is larger than the sum of its proper divisors (1).

17921000401 is an equidigital number, since it uses as much as digits as its factorization.

17921000401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 504, while the sum is 25.

The spelling of 17921000401 in words is "seventeen billion, nine hundred twenty-one million, four hundred one", and thus it is an aban number.