2646221 has 4 divisors (see below), whose sum is σ = 2737500. Its totient is φ = 2554944.

The previous prime is 2646211. The next prime is 2646227. The reversal of 2646221 is 1226462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1226462 = 2 ⋅613231.

It can be written as a sum of positive squares in 2 ways, for example, as 470596 + 2175625 = 686^2 + 1475^2 .

It is a cyclic number.

It is not a de Polignac number, because 2646221 - 2¹⁸ = 2384077 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 (2646227) 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, 45596 + ... + 45653.

It is an arithmetic number, because the mean of its divisors is an integer number (684375).

2^2646221 is an apocalyptic number.

It is an amenable number.

2646221 is a deficient number, since it is larger than the sum of its proper divisors (91279).

2646221 is an equidigital number, since it uses as much as digits as its factorization.

2646221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91278.

The product of its digits is 1152, while the sum is 23.

The square root of 2646221 is about 1626.7209348871. The cubic root of 2646221 is about 138.3169393969.

The spelling of 2646221 in words is "two million, six hundred forty-six thousand, two hundred twenty-one".