71489567821 has 16 divisors (see below), whose sum is σ = 84779532288. Its totient is φ = 58989596400.

The previous prime is 71489567777. The next prime is 71489567839. The reversal of 71489567821 is 12876598417.

It is not a de Polignac number, because 71489567821 - 2⁷ = 71489567693 is a prime.

It is a super-2 number, since 2×71489567821² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71489567321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 820975 + ... + 903868.

It is an arithmetic number, because the mean of its divisors is an integer number (5298720768).

Almost surely, 2^71489567821 is an apocalyptic number.

It is an amenable number.

71489567821 is a deficient number, since it is larger than the sum of its proper divisors (13289964467).

71489567821 is a wasteful number, since it uses less digits than its factorization.

71489567821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1725072.

The product of its digits is 6773760, while the sum is 58.

The spelling of 71489567821 in words is "seventy-one billion, four hundred eighty-nine million, five hundred sixty-seven thousand, eight hundred twenty-one".