1224031921 has 8 divisors (see below), whose sum is σ = 1402012800. Its totient is φ = 1046830848.

The previous prime is 1224031903. The next prime is 1224031967. The reversal of 1224031921 is 1291304221.

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

It is not a de Polignac number, because 1224031921 - 2¹⁹ = 1223507633 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1224032921) 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, 191581 + ... + 197866.

It is an arithmetic number, because the mean of its divisors is an integer number (175251600).

Almost surely, 2^1224031921 is an apocalyptic number.

It is an amenable number.

1224031921 is a deficient number, since it is larger than the sum of its proper divisors (177980879).

1224031921 is an equidigital number, since it uses as much as digits as its factorization.

1224031921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389903.

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1224031921 is about 34986.1675666255. The cubic root of 1224031921 is about 1069.7055471251.

The spelling of 1224031921 in words is "one billion, two hundred twenty-four million, thirty-one thousand, nine hundred twenty-one".