7071533605721 has 4 divisors (see below), whose sum is σ = 7615497729252. Its totient is φ = 6527569482192.

The previous prime is 7071533605673. The next prime is 7071533605781. The reversal of 7071533605721 is 1275063351707.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4056743826496 + 3014789779225 = 2014136^2 + 1736315^2 .

It is a cyclic number.

It is not a de Polignac number, because 7071533605721 - 2¹⁰ = 7071533604697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7071533605781) 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, 271982061746 + ... + 271982061771.

It is an arithmetic number, because the mean of its divisors is an integer number (1903874432313).

Almost surely, 2^{7071533605721} is an apocalyptic number.

It is an amenable number.

7071533605721 is a deficient number, since it is larger than the sum of its proper divisors (543964123531).

7071533605721 is a wasteful number, since it uses less digits than its factorization.

7071533605721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543964123530.

The product of its (nonzero) digits is 926100, while the sum is 47.

The spelling of 7071533605721 in words is "seven trillion, seventy-one billion, five hundred thirty-three million, six hundred five thousand, seven hundred twenty-one".