19787211347 has 4 divisors (see below), whose sum is σ = 19815847656. Its totient is φ = 19758575040.

The previous prime is 19787211343. The next prime is 19787211349. The reversal of 19787211347 is 74311278791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74311278791 = 233 ⋅318932527.

It is a cyclic number.

It is not a de Polignac number, because 19787211347 - 2² = 19787211343 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19787211295 and 19787211304.

It is not an unprimeable number, because it can be changed into a prime (19787211343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14317118 + ... + 14318499.

It is an arithmetic number, because the mean of its divisors is an integer number (4953961914).

Almost surely, 2^19787211347 is an apocalyptic number.

19787211347 is a deficient number, since it is larger than the sum of its proper divisors (28636309).

19787211347 is an equidigital number, since it uses as much as digits as its factorization.

19787211347 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28636308.

The product of its digits is 592704, while the sum is 50.

The spelling of 19787211347 in words is "nineteen billion, seven hundred eighty-seven million, two hundred eleven thousand, three hundred forty-seven".