19597921043 has 4 divisors (see below), whose sum is σ = 19598357808. Its totient is φ = 19597484280.

The previous prime is 19597921009. The next prime is 19597921139. The reversal of 19597921043 is 34012979591.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19597921043 - 2⁸ = 19597920787 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19597920982 and 19597921000.

It is not an unprimeable number, because it can be changed into a prime (19597921003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142223 + ... + 243768.

It is an arithmetic number, because the mean of its divisors is an integer number (4899589452).

Almost surely, 2^19597921043 is an apocalyptic number.

19597921043 is a deficient number, since it is larger than the sum of its proper divisors (436765).

19597921043 is an equidigital number, since it uses as much as digits as its factorization.

19597921043 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436764.

The product of its (nonzero) digits is 612360, while the sum is 50.

The spelling of 19597921043 in words is "nineteen billion, five hundred ninety-seven million, nine hundred twenty-one thousand, forty-three".