17671380921 has 12 divisors (see below), whose sum is σ = 26118940848. Its totient is φ = 11506945464.

The previous prime is 17671380917. The next prime is 17671380941. The reversal of 17671380921 is 12908317671.

It is not a de Polignac number, because 17671380921 - 2² = 17671380917 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (17671380941) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22830855 + ... + 22831628.

It is an arithmetic number, because the mean of its divisors is an integer number (2176578404).

Almost surely, 2^17671380921 is an apocalyptic number.

It is an amenable number.

17671380921 is a deficient number, since it is larger than the sum of its proper divisors (8447559927).

17671380921 is a wasteful number, since it uses less digits than its factorization.

17671380921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45662532 (or 45662529 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The spelling of 17671380921 in words is "seventeen billion, six hundred seventy-one million, three hundred eighty thousand, nine hundred twenty-one".