2202721 has 6 divisors (see below), whose sum is σ = 2265270. Its totient is φ = 2141856.

The previous prime is 2202719. The next prime is 2202763. The reversal of 2202721 is 1272022.

It can be written as a sum of positive squares in 3 ways, for example, as 1860496 + 342225 = 1364^2 + 585^2 .

It is not a de Polignac number, because 2202721 - 2¹ = 2202719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2202695 and 2202704.

It is not an unprimeable number, because it can be changed into a prime (2202791) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 565 + ... + 2173.

It is an arithmetic number, because the mean of its divisors is an integer number (377545).

2^2202721 is an apocalyptic number.

It is an amenable number.

2202721 is a deficient number, since it is larger than the sum of its proper divisors (62549).

2202721 is an equidigital number, since it uses as much as digits as its factorization.

2202721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1683 (or 1646 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 16.

The square root of 2202721 is about 1484.1566628897. The cubic root of 2202721 is about 130.1127424326.

Adding to 2202721 its reverse (1272022), we get a palindrome (3474743).

The spelling of 2202721 in words is "two million, two hundred two thousand, seven hundred twenty-one".