71248421 has 8 divisors (see below), whose sum is σ = 73825944. Its totient is φ = 68705280.

The previous prime is 71248369. The next prime is 71248433. The reversal of 71248421 is 12484217.

It can be written as a sum of positive squares in 4 ways, for example, as 18395521 + 52852900 = 4289^2 + 7270^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 71248421 - 2²⁶ = 4139557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71241421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4340 + ... + 12701.

It is an arithmetic number, because the mean of its divisors is an integer number (9228243).

Almost surely, 2^71248421 is an apocalyptic number.

It is an amenable number.

71248421 is a deficient number, since it is larger than the sum of its proper divisors (2577523).

71248421 is a wasteful number, since it uses less digits than its factorization.

71248421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17191.

The product of its digits is 3584, while the sum is 29.

The square root of 71248421 is about 8440.8779756611. The cubic root of 71248421 is about 414.5641546061.

The spelling of 71248421 in words is "seventy-one million, two hundred forty-eight thousand, four hundred twenty-one".