71221715 has 16 divisors (see below), whose sum is σ = 87950016. Its totient is φ = 55334400.

The previous prime is 71221697. The next prime is 71221723. The reversal of 71221715 is 51712217.

It is not a de Polignac number, because 71221715 - 2¹⁰ = 71220691 is a prime.

It is a Duffinian number.

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, 53255 + ... + 54575.

It is an arithmetic number, because the mean of its divisors is an integer number (5496876).

Almost surely, 2^71221715 is an apocalyptic number.

71221715 is a deficient number, since it is larger than the sum of its proper divisors (16728301).

71221715 is a wasteful number, since it uses less digits than its factorization.

71221715 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630.

The product of its digits is 980, while the sum is 26.

The square root of 71221715 is about 8439.2958829514. The cubic root of 71221715 is about 414.5123511942.

The spelling of 71221715 in words is "seventy-one million, two hundred twenty-one thousand, seven hundred fifteen".