7045681921 has 4 divisors (see below), whose sum is σ = 7288636500. Its totient is φ = 6802727344.

The previous prime is 7045681919. The next prime is 7045681933. The reversal of 7045681921 is 1291865407.

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 5574115600 + 1471566321 = 74660^2 + 38361^2 .

It is a cyclic number.

It is not a de Polignac number, because 7045681921 - 2¹ = 7045681919 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (7045681961) 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, 121477246 + ... + 121477303.

It is an arithmetic number, because the mean of its divisors is an integer number (1822159125).

Almost surely, 2^7045681921 is an apocalyptic number.

It is an amenable number.

7045681921 is a deficient number, since it is larger than the sum of its proper divisors (242954579).

7045681921 is a wasteful number, since it uses less digits than its factorization.

7045681921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 242954578.

The product of its (nonzero) digits is 120960, while the sum is 43.

The square root of 7045681921 is about 83938.5603938976. The cubic root of 7045681921 is about 1917.0834191164.

The spelling of 7045681921 in words is "seven billion, forty-five million, six hundred eighty-one thousand, nine hundred twenty-one".