71255421 has 12 divisors (see below), whose sum is σ = 104669760. Its totient is φ = 46698120.

The previous prime is 71255369. The next prime is 71255467. The reversal of 71255421 is 12455217.

It is not a de Polignac number, because 71255421 - 2¹¹ = 71253373 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71251421) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66565 + ... + 67626.

It is an arithmetic number, because the mean of its divisors is an integer number (8722480).

Almost surely, 2^71255421 is an apocalyptic number.

It is an amenable number.

71255421 is a deficient number, since it is larger than the sum of its proper divisors (33414339).

71255421 is a wasteful number, since it uses less digits than its factorization.

71255421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134256 (or 134253 counting only the distinct ones).

The product of its digits is 2800, while the sum is 27.

The square root of 71255421 is about 8441.2926142860. The cubic root of 71255421 is about 414.5777308323.

The spelling of 71255421 in words is "seventy-one million, two hundred fifty-five thousand, four hundred twenty-one".