19706421449 has 8 divisors (see below), whose sum is σ = 23151600192. Its totient is φ = 16536857040.

The previous prime is 19706421443. The next prime is 19706421451. The reversal of 19706421449 is 94412460791.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-19706421449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19706421443) 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 7 ways as a sum of consecutive naturals, for example, 68903429 + ... + 68903714.

It is an arithmetic number, because the mean of its divisors is an integer number (2893950024).

Almost surely, 2^19706421449 is an apocalyptic number.

It is an amenable number.

19706421449 is a deficient number, since it is larger than the sum of its proper divisors (3445178743).

19706421449 is a wasteful number, since it uses less digits than its factorization.

19706421449 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137807167.

The product of its (nonzero) digits is 435456, while the sum is 47.

The spelling of 19706421449 in words is "nineteen billion, seven hundred six million, four hundred twenty-one thousand, four hundred forty-nine".