1224220321 has 4 divisors (see below), whose sum is σ = 1224403200. Its totient is φ = 1224037444.

The previous prime is 1224220301. The next prime is 1224220343. The reversal of 1224220321 is 1230224221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1230224221 = 197 ⋅6244793.

It is a cyclic number.

It is not a de Polignac number, because 1224220321 - 2¹⁷ = 1224089249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224220301) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81001 + ... + 94918.

It is an arithmetic number, because the mean of its divisors is an integer number (306100800).

Almost surely, 2^1224220321 is an apocalyptic number.

It is an amenable number.

1224220321 is a deficient number, since it is larger than the sum of its proper divisors (182879).

1224220321 is an equidigital number, since it uses as much as digits as its factorization.

1224220321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182878.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1224220321 is about 34988.8599557059. The cubic root of 1224220321 is about 1069.7604264635.

Adding to 1224220321 its reverse (1230224221), we get a palindrome (2454444542).

The spelling of 1224220321 in words is "one billion, two hundred twenty-four million, two hundred twenty thousand, three hundred twenty-one".