1224443021 has 4 divisors (see below), whose sum is σ = 1225238112. Its totient is φ = 1223647932.

The previous prime is 1224442993. The next prime is 1224443039. The reversal of 1224443021 is 1203444221.

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.

It is a cyclic number.

It is not a de Polignac number, because 1224443021 - 2¹⁸ = 1224180877 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 (1224443621) 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, 395231 + ... + 398316.

It is an arithmetic number, because the mean of its divisors is an integer number (306309528).

Almost surely, 2^1224443021 is an apocalyptic number.

It is an amenable number.

1224443021 is a deficient number, since it is larger than the sum of its proper divisors (795091).

1224443021 is an equidigital number, since it uses as much as digits as its factorization.

1224443021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 795090.

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

The square root of 1224443021 is about 34992.0422524894. The cubic root of 1224443021 is about 1069.8252898432.

Adding to 1224443021 its reverse (1203444221), we get a palindrome (2427887242).

The spelling of 1224443021 in words is "one billion, two hundred twenty-four million, four hundred forty-three thousand, twenty-one".