2708228221 has 4 divisors (see below), whose sum is σ = 2718766332. Its totient is φ = 2697690112.

The previous prime is 2708228167. The next prime is 2708228273. The reversal of 2708228221 is 1228228072.

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 2607225721 + 101002500 = 51061^2 + 10050^2 .

It is a cyclic number.

It is not a de Polignac number, because 2708228221 - 2⁷ = 2708228093 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 (2708228521) 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, 5268670 + ... + 5269183.

It is an arithmetic number, because the mean of its divisors is an integer number (679691583).

Almost surely, 2^2708228221 is an apocalyptic number.

It is an amenable number.

2708228221 is a deficient number, since it is larger than the sum of its proper divisors (10538111).

2708228221 is a wasteful number, since it uses less digits than its factorization.

2708228221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10538110.

The product of its (nonzero) digits is 14336, while the sum is 34.

The square root of 2708228221 is about 52040.6400902218. The cubic root of 2708228221 is about 1393.8897348126.

The spelling of 2708228221 in words is "two billion, seven hundred eight million, two hundred twenty-eight thousand, two hundred twenty-one".