1224243021 has 8 divisors (see below), whose sum is σ = 1632829120. Its totient is φ = 815909472.

The previous prime is 1224243019. The next prime is 1224243029. The reversal of 1224243021 is 1203424221.

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

It is not a de Polignac number, because 1224243021 - 2¹ = 1224243019 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1224243029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 51520 + ... + 71433.

It is an arithmetic number, because the mean of its divisors is an integer number (204103640).

Almost surely, 2^1224243021 is an apocalyptic number.

It is an amenable number.

1224243021 is a deficient number, since it is larger than the sum of its proper divisors (408586099).

1224243021 is a wasteful number, since it uses less digits than its factorization.

1224243021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126275.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1224243021 is about 34989.1843431652. The cubic root of 1224243021 is about 1069.7670384029.

Adding to 1224243021 its reverse (1203424221), we get a palindrome (2427667242).

The spelling of 1224243021 in words is "one billion, two hundred twenty-four million, two hundred forty-three thousand, twenty-one".