71221045 has 8 divisors (see below), whose sum is σ = 97674624. Its totient is φ = 48837264.

The previous prime is 71221021. The next prime is 71221049. The reversal of 71221045 is 54012217.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 71221045 - 2⁹ = 71220533 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 (71221049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1017409 + ... + 1017478.

It is an arithmetic number, because the mean of its divisors is an integer number (12209328).

Almost surely, 2^71221045 is an apocalyptic number.

It is an amenable number.

71221045 is a deficient number, since it is larger than the sum of its proper divisors (26453579).

71221045 is a wasteful number, since it uses less digits than its factorization.

71221045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2034899.

The product of its (nonzero) digits is 560, while the sum is 22.

The square root of 71221045 is about 8439.2561876033. The cubic root of 71221045 is about 414.5110513840.

The spelling of 71221045 in words is "seventy-one million, two hundred twenty-one thousand, forty-five".