1205221 has 4 divisors (see below), whose sum is σ = 1230912. Its totient is φ = 1179532.

The previous prime is 1205219. The next prime is 1205231. The reversal of 1205221 is 1225021.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1225021 = 7 ⋅175003.

It is a cyclic number.

It is not a de Polignac number, because 1205221 - 2¹ = 1205219 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 (1205231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12775 + ... + 12868.

It is an arithmetic number, because the mean of its divisors is an integer number (307728).

2^1205221 is an apocalyptic number.

It is an amenable number.

1205221 is a deficient number, since it is larger than the sum of its proper divisors (25691).

1205221 is an equidigital number, since it uses as much as digits as its factorization.

1205221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25690.

The product of its (nonzero) digits is 40, while the sum is 13.

The square root of 1205221 is about 1097.8255781316. The cubic root of 1205221 is about 106.4197489582.

The spelling of 1205221 in words is "one million, two hundred five thousand, two hundred twenty-one".