1221441 has 8 divisors (see below), whose sum is σ = 1753920. Its totient is φ = 751632.

The previous prime is 1221427. The next prime is 1221443. The reversal of 1221441 is 1441221.

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

It is a de Polignac number, because none of the positive numbers 2^k-1221441 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1221441.

It is not an unprimeable number, because it can be changed into a prime (1221443) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15621 + ... + 15698.

It is an arithmetic number, because the mean of its divisors is an integer number (219240).

2^1221441 is an apocalyptic number.

It is an amenable number.

1221441 is a deficient number, since it is larger than the sum of its proper divisors (532479).

1221441 is a wasteful number, since it uses less digits than its factorization.

1221441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31335.

The product of its digits is 64, while the sum is 15.

The square root of 1221441 is about 1105.1882192640. The cubic root of 1221441 is about 106.8950261710.

Adding to 1221441 its reverse (1441221), we get a palindrome (2662662).

The spelling of 1221441 in words is "one million, two hundred twenty-one thousand, four hundred forty-one".