1221041 has 4 divisors (see below), whose sum is σ = 1223412. Its totient is φ = 1218672.

The previous prime is 1221029. The next prime is 1221049. The reversal of 1221041 is 1401221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1401221 = 269 ⋅5209.

It can be written as a sum of positive squares in 2 ways, for example, as 758641 + 462400 = 871^2 + 680^2 .

It is a cyclic number.

It is not a de Polignac number, because 1221041 - 2¹⁸ = 958897 is a prime.

It is a super-2 number, since 2×1221041² = 2981882247362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1221049) 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, 50 + ... + 1563.

It is an arithmetic number, because the mean of its divisors is an integer number (305853).

2^1221041 is an apocalyptic number.

It is an amenable number.

1221041 is a deficient number, since it is larger than the sum of its proper divisors (2371).

1221041 is an equidigital number, since it uses as much as digits as its factorization.

1221041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2370.

The product of its (nonzero) digits is 16, while the sum is 11.

The square root of 1221041 is about 1105.0072397953. The cubic root of 1221041 is about 106.8833561630.

Subtracting from 1221041 its product of nonzero digits (16), we obtain a square (1221025 = 1105²).

Adding to 1221041 its reverse (1401221), we get a palindrome (2622262).

The spelling of 1221041 in words is "one million, two hundred twenty-one thousand, forty-one".