71057321 has 4 divisors (see below), whose sum is σ = 74797200. Its totient is φ = 67317444.

The previous prime is 71057303. The next prime is 71057323. The reversal of 71057321 is 12375017.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 71057321 - 2⁶ = 71057257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71057323) 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, 1869911 + ... + 1869948.

It is an arithmetic number, because the mean of its divisors is an integer number (18699300).

Almost surely, 2^71057321 is an apocalyptic number.

It is an amenable number.

71057321 is a deficient number, since it is larger than the sum of its proper divisors (3739879).

71057321 is a wasteful number, since it uses less digits than its factorization.

71057321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3739878.

The product of its (nonzero) digits is 1470, while the sum is 26.

The square root of 71057321 is about 8429.5504625098. The cubic root of 71057321 is about 414.1931796218.

The spelling of 71057321 in words is "seventy-one million, fifty-seven thousand, three hundred twenty-one".