1221568 has 14 divisors (see below), whose sum is σ = 2424176. Its totient is φ = 610752.

The previous prime is 1221559. The next prime is 1221589. The reversal of 1221568 is 8651221.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9480 + ... + 9607.

2^1221568 is an apocalyptic number.

It is an amenable number.

1221568 is a deficient number, since it is larger than the sum of its proper divisors (1202608).

1221568 is an equidigital number, since it uses as much as digits as its factorization.

1221568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19099 (or 19089 counting only the distinct ones).

The product of its digits is 960, while the sum is 25.

The square root of 1221568 is about 1105.2456740472. The cubic root of 1221568 is about 106.8987308657.

Adding to 1221568 its reverse (8651221), we get a palindrome (9872789).

The spelling of 1221568 in words is "one million, two hundred twenty-one thousand, five hundred sixty-eight".