19468920721 has 8 divisors (see below), whose sum is σ = 19747364544. Its totient is φ = 19190594640.

The previous prime is 19468920719. The next prime is 19468920733. The reversal of 19468920721 is 12702986491.

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

It is a cyclic number.

It is not a de Polignac number, because 19468920721 - 2¹ = 19468920719 is a prime.

It is a super-3 number, since 3×19468920721³ (a number of 32 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19468920781) 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, 335751 + ... + 389443.

It is an arithmetic number, because the mean of its divisors is an integer number (2468420568).

Almost surely, 2^19468920721 is an apocalyptic number.

It is an amenable number.

19468920721 is a deficient number, since it is larger than the sum of its proper divisors (278443823).

19468920721 is an equidigital number, since it uses as much as digits as its factorization.

19468920721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58871.

The product of its (nonzero) digits is 435456, while the sum is 49.

The spelling of 19468920721 in words is "nineteen billion, four hundred sixty-eight million, nine hundred twenty thousand, seven hundred twenty-one".