2456221 has 4 divisors (see below), whose sum is σ = 2465244. Its totient is φ = 2447200.

The previous prime is 2456197. The next prime is 2456243. The reversal of 2456221 is 1226542.

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 1028196 + 1428025 = 1014^2 + 1195^2 .

It is a cyclic number.

It is not a de Polignac number, because 2456221 - 2¹³ = 2448029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2456192 and 2456201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2456261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4090 + ... + 4651.

It is an arithmetic number, because the mean of its divisors is an integer number (616311).

2^2456221 is an apocalyptic number.

It is an amenable number.

2456221 is a deficient number, since it is larger than the sum of its proper divisors (9023).

2456221 is an equidigital number, since it uses as much as digits as its factorization.

2456221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9022.

The product of its digits is 960, while the sum is 22.

The square root of 2456221 is about 1567.2335499216. The cubic root of 2456221 is about 134.9239809783.

The spelling of 2456221 in words is "two million, four hundred fifty-six thousand, two hundred twenty-one".