19312740021 has 8 divisors (see below), whose sum is σ = 25751036160. Its totient is φ = 12874801952.

The previous prime is 19312739899. The next prime is 19312740023. The reversal of 19312740021 is 12004721391.

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 19312740021 - 2⁷ = 19312739893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19312740023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84865 + ... + 214073.

It is an arithmetic number, because the mean of its divisors is an integer number (3218879520).

Almost surely, 2^19312740021 is an apocalyptic number.

It is an amenable number.

19312740021 is a deficient number, since it is larger than the sum of its proper divisors (6438296139).

19312740021 is a wasteful number, since it uses less digits than its factorization.

19312740021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 179035.

The product of its (nonzero) digits is 3024, while the sum is 30.

The spelling of 19312740021 in words is "nineteen billion, three hundred twelve million, seven hundred forty thousand, twenty-one".