19519421444 has 6 divisors (see below), whose sum is σ = 34158987534. Its totient is φ = 9759710720.

The previous prime is 19519421429. The next prime is 19519421461. The reversal of 19519421444 is 44412491591.

It can be written as a sum of positive squares in only one way, i.e., 12670203844 + 6849217600 = 112562^2 + 82760^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19519421395 and 19519421404.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2439927677 + ... + 2439927684.

It is an arithmetic number, because the mean of its divisors is an integer number (5693164589).

Almost surely, 2^19519421444 is an apocalyptic number.

It is an amenable number.

19519421444 is a deficient number, since it is larger than the sum of its proper divisors (14639566090).

19519421444 is a wasteful number, since it uses less digits than its factorization.

19519421444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4879855365 (or 4879855363 counting only the distinct ones).

The product of its digits is 207360, while the sum is 44.

The spelling of 19519421444 in words is "nineteen billion, five hundred nineteen million, four hundred twenty-one thousand, four hundred forty-four".