1230221 has 4 divisors (see below), whose sum is σ = 1239744. Its totient is φ = 1220700.

The previous prime is 1230199. The next prime is 1230223. The reversal of 1230221 is 1220321.

It is a happy number.

1230221 is nontrivially palindromic in base 3.

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: 1220321 = 353 ⋅3457.

It is a cyclic number.

It is not a de Polignac number, because 1230221 - 2¹⁰ = 1229197 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 (1230223) 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, 4565 + ... + 4826.

It is an arithmetic number, because the mean of its divisors is an integer number (309936).

2^1230221 is an apocalyptic number.

It is an amenable number.

1230221 is a deficient number, since it is larger than the sum of its proper divisors (9523).

1230221 is an equidigital number, since it uses as much as digits as its factorization.

1230221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9522.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1230221 is about 1109.1532806605. The cubic root of 1230221 is about 107.1505436179.

Adding to 1230221 its reverse (1220321), we get a palindrome (2450542).

The spelling of 1230221 in words is "one million, two hundred thirty thousand, two hundred twenty-one".