71219889971 has 2 divisors, whose sum is σ = 71219889972. Its totient is φ = 71219889970.

The previous prime is 71219889901. The next prime is 71219890003. The reversal of 71219889971 is 17998891217.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 71219889971 - 2¹⁰ = 71219888947 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (71219889901) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35609944985 + 35609944986.

It is an arithmetic number, because the mean of its divisors is an integer number (35609944986).

Almost surely, 2^71219889971 is an apocalyptic number.

71219889971 is a deficient number, since it is larger than the sum of its proper divisors (1).

71219889971 is an equidigital number, since it uses as much as digits as its factorization.

71219889971 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4572288, while the sum is 62.

The spelling of 71219889971 in words is "seventy-one billion, two hundred nineteen million, eight hundred eighty-nine thousand, nine hundred seventy-one".