71221305 has 16 divisors (see below), whose sum is σ = 116734464. Its totient is φ = 37057920.

The previous prime is 71221289. The next prime is 71221331. The reversal of 71221305 is 50312217.

It is not a de Polignac number, because 71221305 - 2⁴ = 71221289 is a prime.

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, 57289 + ... + 58518.

It is an arithmetic number, because the mean of its divisors is an integer number (7295904).

Almost surely, 2^71221305 is an apocalyptic number.

It is an amenable number.

71221305 is a deficient number, since it is larger than the sum of its proper divisors (45513159).

71221305 is a wasteful number, since it uses less digits than its factorization.

71221305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115856.

The product of its (nonzero) digits is 420, while the sum is 21.

The square root of 71221305 is about 8439.2715917904. The cubic root of 71221305 is about 414.5115557889.

The spelling of 71221305 in words is "seventy-one million, two hundred twenty-one thousand, three hundred five".