1224000221 has 8 divisors (see below), whose sum is σ = 1296579960. Its totient is φ = 1151484928.

The previous prime is 1224000181. The next prime is 1224000229. The reversal of 1224000221 is 1220004221.

It can be written as a sum of positive squares in 4 ways, for example, as 338044996 + 885955225 = 18386^2 + 29765^2 .

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 1224000221 - 2⁶ = 1224000157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1224000196 and 1224000205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224000229) 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, 26195 + ... + 55983.

It is an arithmetic number, because the mean of its divisors is an integer number (162072495).

Almost surely, 2^1224000221 is an apocalyptic number.

It is an amenable number.

1224000221 is a deficient number, since it is larger than the sum of its proper divisors (72579739).

1224000221 is a wasteful number, since it uses less digits than its factorization.

1224000221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32223.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 1224000221 is about 34985.7145275039. The cubic root of 1224000221 is about 1069.6963126277.

Adding to 1224000221 its reverse (1220004221), we get a palindrome (2444004442).

It can be divided in two parts, 1224000 and 221, that added together give a palindrome (1224221).

The spelling of 1224000221 in words is "one billion, two hundred twenty-four million, two hundred twenty-one", and thus it is an aban number.