1231221 has 8 divisors (see below), whose sum is σ = 1658944. Its totient is φ = 812160.

The previous prime is 1231207. The next prime is 1231229. The reversal of 1231221 is 1221321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1231221 - 2⁷ = 1231093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1231197 and 1231206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231229) 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 7 ways as a sum of consecutive naturals, for example, 1825 + ... + 2406.

It is an arithmetic number, because the mean of its divisors is an integer number (207368).

2^1231221 is an apocalyptic number.

It is an amenable number.

1231221 is a deficient number, since it is larger than the sum of its proper divisors (427723).

1231221 is an equidigital number, since it uses as much as digits as its factorization.

1231221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331.

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

The square root of 1231221 is about 1109.6039834103. The cubic root of 1231221 is about 107.1795686261.

Adding to 1231221 its reverse (1221321), we get a palindrome (2452542).

The spelling of 1231221 in words is "one million, two hundred thirty-one thousand, two hundred twenty-one".