71298589921 has 4 divisors (see below), whose sum is σ = 76783096852. Its totient is φ = 65814082992.

The previous prime is 71298589913. The next prime is 71298589931. The reversal of 71298589921 is 12998589217.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28144759696 + 43153830225 = 167764^2 + 207735^2 .

It is a cyclic number.

It is not a de Polignac number, because 71298589921 - 2³ = 71298589913 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 71298589921.

It is not an unprimeable number, because it can be changed into a prime (71298589931) 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, 2742253446 + ... + 2742253471.

It is an arithmetic number, because the mean of its divisors is an integer number (19195774213).

Almost surely, 2^71298589921 is an apocalyptic number.

It is an amenable number.

71298589921 is a deficient number, since it is larger than the sum of its proper divisors (5484506931).

71298589921 is a wasteful number, since it uses less digits than its factorization.

71298589921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5484506930.

The product of its digits is 6531840, while the sum is 61.

The spelling of 71298589921 in words is "seventy-one billion, two hundred ninety-eight million, five hundred eighty-nine thousand, nine hundred twenty-one".