21617170803 has 12 divisors (see below), whose sum is σ = 31601005800. Its totient is φ = 14237814816.

The previous prime is 21617170753. The next prime is 21617170819. The reversal of 21617170803 is 30807171612.

21617170803 is a `hidden beast` number, since 21 + 617 + 17 + 0 + 8 + 0 + 3 = 666.

It is not a de Polignac number, because 21617170803 - 2³⁴ = 4437301619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21617171803) 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 in 11 ways as a sum of consecutive naturals, for example, 14468578 + ... + 14470071.

It is an arithmetic number, because the mean of its divisors is an integer number (2633417150).

Almost surely, 2^21617170803 is an apocalyptic number.

21617170803 is a deficient number, since it is larger than the sum of its proper divisors (9983834997).

21617170803 is a wasteful number, since it uses less digits than its factorization.

21617170803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28938738 (or 28938735 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The spelling of 21617170803 in words is "twenty-one billion, six hundred seventeen million, one hundred seventy thousand, eight hundred three".