1224255521 has 8 divisors (see below), whose sum is σ = 1229526144. Its totient is φ = 1218993840.

The previous prime is 1224255517. The next prime is 1224255541. The reversal of 1224255521 is 1255524221.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 1224255521 - 2² = 1224255517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224255511) 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, 457016 + ... + 459686.

It is an arithmetic number, because the mean of its divisors is an integer number (153690768).

Almost surely, 2^1224255521 is an apocalyptic number.

It is an amenable number.

1224255521 is a deficient number, since it is larger than the sum of its proper divisors (5270623).

1224255521 is a wasteful number, since it uses less digits than its factorization.

1224255521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

The product of its digits is 8000, while the sum is 29.

The square root of 1224255521 is about 34989.3629693368. The cubic root of 1224255521 is about 1069.7706793038.

Adding to 1224255521 its reverse (1255524221), we get a palindrome (2479779742).

The spelling of 1224255521 in words is "one billion, two hundred twenty-four million, two hundred fifty-five thousand, five hundred twenty-one".