19321005021 has 4 divisors (see below), whose sum is σ = 25761340032. Its totient is φ = 12880670012.

The previous prime is 19321005013. The next prime is 19321005049. The reversal of 19321005021 is 12050012391.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12050012391 = 3 ⋅4016670797.

It is a cyclic number.

It is not a de Polignac number, because 19321005021 - 2³ = 19321005013 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19321004982 and 19321005000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19321005071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3220167501 + ... + 3220167506.

It is an arithmetic number, because the mean of its divisors is an integer number (6440335008).

Almost surely, 2^19321005021 is an apocalyptic number.

It is an amenable number.

19321005021 is a deficient number, since it is larger than the sum of its proper divisors (6440335011).

19321005021 is an equidigital number, since it uses as much as digits as its factorization.

19321005021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6440335010.

The product of its (nonzero) digits is 540, while the sum is 24.

The spelling of 19321005021 in words is "nineteen billion, three hundred twenty-one million, five thousand, twenty-one".