19475399521 has 4 divisors (see below), whose sum is σ = 19479130672. Its totient is φ = 19471668372.

The previous prime is 19475399519. The next prime is 19475399543. The reversal of 19475399521 is 12599357491.

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.

It is a cyclic number.

It is not a de Polignac number, because 19475399521 - 2¹ = 19475399519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19475399561) 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 3 ways as a sum of consecutive naturals, for example, 1857735 + ... + 1868188.

It is an arithmetic number, because the mean of its divisors is an integer number (4869782668).

Almost surely, 2^19475399521 is an apocalyptic number.

It is an amenable number.

19475399521 is a deficient number, since it is larger than the sum of its proper divisors (3731151).

19475399521 is an equidigital number, since it uses as much as digits as its factorization.

19475399521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3731150.

The product of its digits is 3061800, while the sum is 55.

The spelling of 19475399521 in words is "nineteen billion, four hundred seventy-five million, three hundred ninety-nine thousand, five hundred twenty-one".