19971302443 has 4 divisors (see below), whose sum is σ = 20074780888. Its totient is φ = 19867824000.

The previous prime is 19971302441. The next prime is 19971302459. The reversal of 19971302443 is 34420317991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19971302443 - 2¹ = 19971302441 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19971302443.

It is not an unprimeable number, because it can be changed into a prime (19971302441) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51738933 + ... + 51739318.

It is an arithmetic number, because the mean of its divisors is an integer number (5018695222).

Almost surely, 2^19971302443 is an apocalyptic number.

19971302443 is a deficient number, since it is larger than the sum of its proper divisors (103478445).

19971302443 is a wasteful number, since it uses less digits than its factorization.

19971302443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103478444.

The product of its (nonzero) digits is 163296, while the sum is 43.

The spelling of 19971302443 in words is "nineteen billion, nine hundred seventy-one million, three hundred two thousand, four hundred forty-three".