2221817 has 8 divisors (see below), whose sum is σ = 2405256. Its totient is φ = 2040192.

The previous prime is 2221789. The next prime is 2221829. The reversal of 2221817 is 7181222.

It can be written as a sum of positive squares in 4 ways, for example, as 179776 + 2042041 = 424^2 + 1429^2 .

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 2221817 - 2⁶ = 2221753 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2221792 and 2221801.

It is not an unprimeable number, because it can be changed into a prime (2221837) 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 7 ways as a sum of consecutive naturals, for example, 3293 + ... + 3909.

It is an arithmetic number, because the mean of its divisors is an integer number (300657).

2^2221817 is an apocalyptic number.

It is an amenable number.

2221817 is a deficient number, since it is larger than the sum of its proper divisors (183439).

2221817 is a wasteful number, since it uses less digits than its factorization.

2221817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 907.

The product of its digits is 448, while the sum is 23.

The square root of 2221817 is about 1490.5760631380. The cubic root of 2221817 is about 130.4876556000.

It can be divided in two parts, 22 and 21817, that multiplied together give a palindrome (479974).

The spelling of 2221817 in words is "two million, two hundred twenty-one thousand, eight hundred seventeen".