21603876417 has 8 divisors (see below), whose sum is σ = 32005742880. Its totient is φ = 14402584260.

The previous prime is 21603876383. The next prime is 21603876443. The reversal of 21603876417 is 71467830612.

21603876417 is a `hidden beast` number, since 2 + 160 + 3 + 8 + 76 + 417 = 666.

It is not a de Polignac number, because 21603876417 - 2⁶ = 21603876353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21603876317) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 400071759 + ... + 400071812.

It is an arithmetic number, because the mean of its divisors is an integer number (4000717860).

Almost surely, 2^21603876417 is an apocalyptic number.

21603876417 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

21603876417 is a deficient number, since it is larger than the sum of its proper divisors (10401866463).

21603876417 is an equidigital number, since it uses as much as digits as its factorization.

21603876417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800143580 (or 800143574 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The spelling of 21603876417 in words is "twenty-one billion, six hundred three million, eight hundred seventy-six thousand, four hundred seventeen".