71021063 has 4 divisors (see below), whose sum is σ = 71074608. Its totient is φ = 70967520.

The previous prime is 71021059. The next prime is 71021099. The reversal of 71021063 is 36012017.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 71021063 - 2² = 71021059 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71021003) 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 3 ways as a sum of consecutive naturals, for example, 24731 + ... + 27452.

It is an arithmetic number, because the mean of its divisors is an integer number (17768652).

Almost surely, 2^71021063 is an apocalyptic number.

71021063 is a deficient number, since it is larger than the sum of its proper divisors (53545).

71021063 is a wasteful number, since it uses less digits than its factorization.

71021063 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53544.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 71021063 is about 8427.3995395970. The cubic root of 71021063 is about 414.1227183324.

The spelling of 71021063 in words is "seventy-one million, twenty-one thousand, sixty-three".