71221007 has 16 divisors (see below), whose sum is σ = 88597152. Its totient is φ = 56248320.

The previous prime is 71221001. The next prime is 71221021. The reversal of 71221007 is 70012217.

It is a cyclic number.

It is not a de Polignac number, because 71221007 - 2¹² = 71216911 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 71221007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71221001) 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 15 ways as a sum of consecutive naturals, for example, 12218 + ... + 17079.

It is an arithmetic number, because the mean of its divisors is an integer number (5537322).

Almost surely, 2^71221007 is an apocalyptic number.

71221007 is a deficient number, since it is larger than the sum of its proper divisors (17376145).

71221007 is a wasteful number, since it uses less digits than its factorization.

71221007 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29338.

The product of its (nonzero) digits is 196, while the sum is 20.

The square root of 71221007 is about 8439.2539362197. The cubic root of 71221007 is about 414.5109776631.

The spelling of 71221007 in words is "seventy-one million, two hundred twenty-one thousand, seven".