1224243221 has 8 divisors (see below), whose sum is σ = 1252562688. Its totient is φ = 1196190000.

The previous prime is 1224243217. The next prime is 1224243233. The reversal of 1224243221 is 1223424221.

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 1224243221 - 2² = 1224243217 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224243521) 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, 57245 + ... + 75666.

It is an arithmetic number, because the mean of its divisors is an integer number (156570336).

Almost surely, 2^1224243221 is an apocalyptic number.

It is an amenable number.

1224243221 is a deficient number, since it is larger than the sum of its proper divisors (28319467).

1224243221 is a wasteful number, since it uses less digits than its factorization.

1224243221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133123.

The product of its digits is 1536, while the sum is 23.

The square root of 1224243221 is about 34989.1872011912. The cubic root of 1224243221 is about 1069.7670966575.

Adding to 1224243221 its reverse (1223424221), we get a palindrome (2447667442).

The spelling of 1224243221 in words is "one billion, two hundred twenty-four million, two hundred forty-three thousand, two hundred twenty-one".