71070003721 has 4 divisors (see below), whose sum is σ = 71364900244. Its totient is φ = 70775107200.

The previous prime is 71070003689. The next prime is 71070003793. The reversal of 71070003721 is 12730007017.

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 20169680400 + 50900323321 = 142020^2 + 225611^2 .

It is a cyclic number.

It is not a de Polignac number, because 71070003721 - 2⁵ = 71070003689 is a prime.

It is a super-3 number, since 3×71070003721³ (a number of 34 digits) contains 333 as substring.

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 71070003721.

It is not an unprimeable number, because it can be changed into a prime (71070003421) 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, 147447900 + ... + 147448381.

It is an arithmetic number, because the mean of its divisors is an integer number (17841225061).

Almost surely, 2^71070003721 is an apocalyptic number.

It is an amenable number.

71070003721 is a deficient number, since it is larger than the sum of its proper divisors (294896523).

71070003721 is a wasteful number, since it uses less digits than its factorization.

71070003721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294896522.

The product of its (nonzero) digits is 2058, while the sum is 28.

The spelling of 71070003721 in words is "seventy-one billion, seventy million, three thousand, seven hundred twenty-one".