7189071721 has 16 divisors (see below), whose sum is σ = 7781922064. Its totient is φ = 6602010624.

The previous prime is 7189071713. The next prime is 7189071737. The reversal of 7189071721 is 1271709817.

It can be written as a sum of positive squares in 8 ways, for example, as 67568400 + 7121503321 = 8220^2 + 84389^2 .

It is a cyclic number.

It is not a de Polignac number, because 7189071721 - 2³ = 7189071713 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7189071761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2233105 + ... + 2236321.

It is an arithmetic number, because the mean of its divisors is an integer number (486370129).

Almost surely, 2^7189071721 is an apocalyptic number.

It is an amenable number.

7189071721 is a deficient number, since it is larger than the sum of its proper divisors (592850343).

7189071721 is a wasteful number, since it uses less digits than its factorization.

7189071721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4060.

The product of its (nonzero) digits is 49392, while the sum is 43.

The square root of 7189071721 is about 84788.3937871216. The cubic root of 7189071721 is about 1930.0013173499.

The spelling of 7189071721 in words is "seven billion, one hundred eighty-nine million, seventy-one thousand, seven hundred twenty-one".