1226221 has 4 divisors (see below), whose sum is σ = 1228444. Its totient is φ = 1224000.

The previous prime is 1226213. The next prime is 1226237.

1226221 is nontrivially palindromic in base 10.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 236196 + 990025 = 486^2 + 995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226221 - 2³ = 1226213 is a prime.

It is a Duffinian number.

1226221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1226195 and 1226204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226321) 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, 421 + ... + 1621.

It is an arithmetic number, because the mean of its divisors is an integer number (307111).

2^1226221 is an apocalyptic number.

It is an amenable number.

1226221 is a deficient number, since it is larger than the sum of its proper divisors (2223).

1226221 is a wasteful number, since it uses less digits than its factorization.

1226221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2222.

The product of its digits is 96, while the sum is 16.

The square root of 1226221 is about 1107.3486352545. The cubic root of 1226221 is about 107.0342860399.

The spelling of 1226221 in words is "one million, two hundred twenty-six thousand, two hundred twenty-one".