71750877421 has 4 divisors (see below), whose sum is σ = 72385841052. Its totient is φ = 71115913792.

The previous prime is 71750877409. The next prime is 71750877439. The reversal of 71750877421 is 12477805717.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12477805717 = 13 ⋅959831209.

It can be written as a sum of positive squares in 2 ways, for example, as 22624371396 + 49126506025 = 150414^2 + 221645^2 .

It is a cyclic number.

It is not a de Polignac number, because 71750877421 - 2⁷ = 71750877293 is a prime.

It is a super-2 number, since 2×71750877421² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71750817421) 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, 317481646 + ... + 317481871.

It is an arithmetic number, because the mean of its divisors is an integer number (18096460263).

Almost surely, 2^71750877421 is an apocalyptic number.

It is an amenable number.

71750877421 is a deficient number, since it is larger than the sum of its proper divisors (634963631).

71750877421 is a wasteful number, since it uses less digits than its factorization.

71750877421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634963630.

The product of its (nonzero) digits is 768320, while the sum is 49.

The spelling of 71750877421 in words is "seventy-one billion, seven hundred fifty million, eight hundred seventy-seven thousand, four hundred twenty-one".