1221411 has 4 divisors (see below), whose sum is σ = 1628552. Its totient is φ = 814272.

The previous prime is 1221391. The next prime is 1221421. The reversal of 1221411 is 1141221.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1221411 - 2⁵ = 1221379 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221421) 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, 203566 + ... + 203571.

It is an arithmetic number, because the mean of its divisors is an integer number (407138).

2^1221411 is an apocalyptic number.

1221411 is a deficient number, since it is larger than the sum of its proper divisors (407141).

1221411 is an equidigital number, since it uses as much as digits as its factorization.

1221411 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 407140.

The product of its digits is 16, while the sum is 12.

The square root of 1221411 is about 1105.1746468319. The cubic root of 1221411 is about 106.8941510088.

Adding to 1221411 its reverse (1141221), we get a palindrome (2362632).

The spelling of 1221411 in words is "one million, two hundred twenty-one thousand, four hundred eleven".