2717221 has 8 divisors (see below), whose sum is σ = 2943864. Its totient is φ = 2493120.

The previous prime is 2717219. The next prime is 2717227. The reversal of 2717221 is 1227172.

2717221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 864900 + 1852321 = 930^2 + 1361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 2717221 - 2¹ = 2717219 is a prime.

It is a Duffinian number.

2717221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 2717192 and 2717201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2717227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2031 + ... + 3091.

It is an arithmetic number, because the mean of its divisors is an integer number (367983).

2^2717221 is an apocalyptic number.

It is an amenable number.

2717221 is a deficient number, since it is larger than the sum of its proper divisors (226643).

2717221 is a wasteful number, since it uses less digits than its factorization.

2717221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1271.

The product of its digits is 392, while the sum is 22.

The square root of 2717221 is about 1648.3995268138. The cubic root of 2717221 is about 139.5430852300.

The spelling of 2717221 in words is "two million, seven hundred seventeen thousand, two hundred twenty-one".