71221033 has 4 divisors (see below), whose sum is σ = 76699588. Its totient is φ = 65742480.

The previous prime is 71221021. The next prime is 71221049. The reversal of 71221033 is 33012217.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 33012217 = 7 ⋅4716031.

It can be written as a sum of positive squares in 2 ways, for example, as 25887744 + 45333289 = 5088^2 + 6733^2 .

It is a cyclic number.

It is not a de Polignac number, because 71221033 - 2⁵ = 71221001 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 71221033.

It is not an unprimeable number, because it can be changed into a prime (71221333) 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, 2739258 + ... + 2739283.

It is an arithmetic number, because the mean of its divisors is an integer number (19174897).

Almost surely, 2^71221033 is an apocalyptic number.

It is an amenable number.

71221033 is a deficient number, since it is larger than the sum of its proper divisors (5478555).

71221033 is a wasteful number, since it uses less digits than its factorization.

71221033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5478554.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 71221033 is about 8439.2554766401. The cubic root of 71221033 is about 414.5110281037.

The spelling of 71221033 in words is "seventy-one million, two hundred twenty-one thousand, thirty-three".