1211321 has 4 divisors (see below), whose sum is σ = 1215972. Its totient is φ = 1206672.

The previous prime is 1211311. The next prime is 1211333. The reversal of 1211321 is 1231121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1231121 = 23 ⋅53527.

It can be written as a sum of positive squares in 2 ways, for example, as 436921 + 774400 = 661^2 + 880^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1211321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1211311) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1910 + ... + 2463.

It is an arithmetic number, because the mean of its divisors is an integer number (303993).

2^1211321 is an apocalyptic number.

It is an amenable number.

1211321 is a deficient number, since it is larger than the sum of its proper divisors (4651).

1211321 is an equidigital number, since it uses as much as digits as its factorization.

1211321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4650.

The product of its digits is 12, while the sum is 11.

The square root of 1211321 is about 1100.6002907505. The cubic root of 1211321 is about 106.5989881009.

Adding to 1211321 its reverse (1231121), we get a palindrome (2442442).

The spelling of 1211321 in words is "one million, two hundred eleven thousand, three hundred twenty-one".