19863211444 has 12 divisors (see below), whose sum is σ = 34776286468. Its totient is φ = 9927129600.

The previous prime is 19863211421. The next prime is 19863211453. The reversal of 19863211444 is 44411236891.

It can be written as a sum of positive squares in 2 ways, for example, as 16116302500 + 3746908944 = 126950^2 + 61212^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 19863211444.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1109037 + ... + 1126804.

Almost surely, 2^19863211444 is an apocalyptic number.

It is an amenable number.

19863211444 is a deficient number, since it is larger than the sum of its proper divisors (14913075024).

19863211444 is a wasteful number, since it uses less digits than its factorization.

19863211444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2238066 (or 2238064 counting only the distinct ones).

The product of its digits is 165888, while the sum is 43.

The spelling of 19863211444 in words is "nineteen billion, eight hundred sixty-three million, two hundred eleven thousand, four hundred forty-four".