19608921 has 12 divisors (see below), whose sum is σ = 28362672. Its totient is φ = 13054776.

The previous prime is 19608907. The next prime is 19608923. The reversal of 19608921 is 12980691.

It is not a de Polignac number, because 19608921 - 2⁷ = 19608793 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19608923) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10930 + ... + 12596.

It is an arithmetic number, because the mean of its divisors is an integer number (2363556).

Almost surely, 2^19608921 is an apocalyptic number.

It is an amenable number.

19608921 is a deficient number, since it is larger than the sum of its proper divisors (8753751).

19608921 is a wasteful number, since it uses less digits than its factorization.

19608921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2980 (or 2977 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 19608921 is about 4428.1961338676. The cubic root of 19608921 is about 269.6608498882.

The spelling of 19608921 in words is "nineteen million, six hundred eight thousand, nine hundred twenty-one".