71021066 has 4 divisors (see below), whose sum is σ = 106531602. Its totient is φ = 35510532.

The previous prime is 71021059. The next prime is 71021099. The reversal of 71021066 is 66012017.

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

It can be written as a sum of positive squares in only one way, i.e., 36857041 + 34164025 = 6071^2 + 5845^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17755265 + ... + 17755268.

Almost surely, 2^71021066 is an apocalyptic number.

71021066 is a deficient number, since it is larger than the sum of its proper divisors (35510536).

71021066 is a wasteful number, since it uses less digits than its factorization.

71021066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35510535.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 71021066 is about 8427.3997175879. The cubic root of 71021066 is about 414.1227241634.

The spelling of 71021066 in words is "seventy-one million, twenty-one thousand, sixty-six".