71219889909 has 24 divisors (see below), whose sum is σ = 119968721600. Its totient is φ = 40697078184.

The previous prime is 71219889901. The next prime is 71219889971. The reversal of 71219889909 is 90998891217.

It is not a de Polignac number, because 71219889909 - 2³ = 71219889901 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71219889901) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11532367 + ... + 11538540.

Almost surely, 2^71219889909 is an apocalyptic number.

It is an amenable number.

71219889909 is a deficient number, since it is larger than the sum of its proper divisors (48748831691).

71219889909 is a wasteful number, since it uses less digits than its factorization.

71219889909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23070934 (or 23070917 counting only the distinct ones).

The product of its (nonzero) digits is 5878656, while the sum is 63.

The spelling of 71219889909 in words is "seventy-one billion, two hundred nineteen million, eight hundred eighty-nine thousand, nine hundred nine".