19431384213 has 4 divisors (see below), whose sum is σ = 25908512288. Its totient is φ = 12954256140.

The previous prime is 19431384179. The next prime is 19431384233. The reversal of 19431384213 is 31248313491.

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 not a de Polignac number, because 19431384213 - 2¹⁷ = 19431253141 is a prime.

It is the 139397-th Hogben number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19431384233) by changing a digit.

It is a nontrivial repunit in base 139396.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3238564033 + ... + 3238564038.

It is an arithmetic number, because the mean of its divisors is an integer number (6477128072).

Almost surely, 2^19431384213 is an apocalyptic number.

It is an amenable number.

19431384213 is a deficient number, since it is larger than the sum of its proper divisors (6477128075).

19431384213 is an equidigital number, since it uses as much as digits as its factorization.

19431384213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6477128074.

The product of its digits is 62208, while the sum is 39.

It can be divided in two parts, 1943138 and 4213, that added together give a triangular number (1947351 = T₁₉₇₃).

The spelling of 19431384213 in words is "nineteen billion, four hundred thirty-one million, three hundred eighty-four thousand, two hundred thirteen".