19680621 has 8 divisors (see below), whose sum is σ = 26511744. Its totient is φ = 12984960.

The previous prime is 19680607. The next prime is 19680641. The reversal of 19680621 is 12608691.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 19680621 - 2¹⁴ = 19664237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19680601) 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 7 ways as a sum of consecutive naturals, for example, 33525 + ... + 34106.

It is an arithmetic number, because the mean of its divisors is an integer number (3313968).

Almost surely, 2^19680621 is an apocalyptic number.

It is an amenable number.

19680621 is a deficient number, since it is larger than the sum of its proper divisors (6831123).

19680621 is an equidigital number, since it uses as much as digits as its factorization.

19680621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67731.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 19680621 is about 4436.2845941170. The cubic root of 19680621 is about 269.9891216468.

It can be divided in two parts, 19680 and 621, that added together give a triangular number (20301 = T₂₀₁).

The spelling of 19680621 in words is "nineteen million, six hundred eighty thousand, six hundred twenty-one".