19544795421 has 16 divisors (see below), whose sum is σ = 26692108800. Its totient is φ = 12716851248.

The previous prime is 19544795419. The next prime is 19544795423. The reversal of 19544795421 is 12459744591.

It is an interprime number because it is at equal distance from previous prime (19544795419) and next prime (19544795423).

It is not a de Polignac number, because 19544795421 - 2¹ = 19544795419 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19544795423) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 372601 + ... + 421806.

It is an arithmetic number, because the mean of its divisors is an integer number (1668256800).

Almost surely, 2^19544795421 is an apocalyptic number.

It is an amenable number.

19544795421 is a deficient number, since it is larger than the sum of its proper divisors (7147313379).

19544795421 is a wasteful number, since it uses less digits than its factorization.

19544795421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794608.

The product of its digits is 1814400, while the sum is 51.

The spelling of 19544795421 in words is "nineteen billion, five hundred forty-four million, seven hundred ninety-five thousand, four hundred twenty-one".