71021065 has 16 divisors (see below), whose sum is σ = 86465808. Its totient is φ = 55996416.

The previous prime is 71021059. The next prime is 71021099. The reversal of 71021065 is 56012017.

It can be written as a sum of positive squares in 8 ways, for example, as 16024009 + 54997056 = 4003^2 + 7416^2 .

It is a cyclic number.

It is not a de Polignac number, because 71021065 - 2¹⁵ = 70988297 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 190219 + ... + 190591.

It is an arithmetic number, because the mean of its divisors is an integer number (5404113).

Almost surely, 2^71021065 is an apocalyptic number.

It is an amenable number.

71021065 is a deficient number, since it is larger than the sum of its proper divisors (15444743).

71021065 is a wasteful number, since it uses less digits than its factorization.

71021065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828.

The product of its (nonzero) digits is 420, while the sum is 22.

The square root of 71021065 is about 8427.3996582576. The cubic root of 71021065 is about 414.1227222197.

The spelling of 71021065 in words is "seventy-one million, twenty-one thousand, sixty-five".