2680328221 has 4 divisors (see below), whose sum is σ = 2686142844. Its totient is φ = 2674513600.

The previous prime is 2680328191. The next prime is 2680328249. The reversal of 2680328221 is 1228230862.

It is a happy number.

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 477903321 + 2202424900 = 21861^2 + 46930^2 .

It is a cyclic number.

It is not a de Polignac number, because 2680328221 - 2⁷ = 2680328093 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2680328281) 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, 2906620 + ... + 2907541.

It is an arithmetic number, because the mean of its divisors is an integer number (671535711).

Almost surely, 2^2680328221 is an apocalyptic number.

It is an amenable number.

2680328221 is a deficient number, since it is larger than the sum of its proper divisors (5814623).

2680328221 is an equidigital number, since it uses as much as digits as its factorization.

2680328221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5814622.

The product of its (nonzero) digits is 18432, while the sum is 34.

The square root of 2680328221 is about 51771.8863959968. The cubic root of 2680328221 is about 1389.0866143647.

The spelling of 2680328221 in words is "two billion, six hundred eighty million, three hundred twenty-eight thousand, two hundred twenty-one".