1321221 has 8 divisors (see below), whose sum is σ = 1921824. Its totient is φ = 800720.

The previous prime is 1321219. The next prime is 1321247. The reversal of 1321221 is 1221231.

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 1321221 - 2¹ = 1321219 is a prime.

1321221 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1321197 and 1321206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19986 + ... + 20051.

It is an arithmetic number, because the mean of its divisors is an integer number (240228).

2^1321221 is an apocalyptic number.

1321221 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1321221 is a deficient number, since it is larger than the sum of its proper divisors (600603).

1321221 is a wasteful number, since it uses less digits than its factorization.

1321221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40051.

The product of its digits is 24, while the sum is 12.

The square root of 1321221 is about 1149.4437785294. The cubic root of 1321221 is about 109.7299435990.

Adding to 1321221 its reverse (1221231), we get a palindrome (2542452).

The spelling of 1321221 in words is "one million, three hundred twenty-one thousand, two hundred twenty-one".