1243124321 has 8 divisors (see below), whose sum is σ = 1258088040. Its totient is φ = 1228182912.

The previous prime is 1243124293. The next prime is 1243124327. The reversal of 1243124321 is 1234213421.

It can be written as a sum of positive squares in 4 ways, for example, as 766182400 + 476941921 = 27680^2 + 21839^2 .

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

It is not a de Polignac number, because 1243124321 - 2⁶ = 1243124257 is a prime.

It is a super-2 number, since 2×1243124321² = 3090716154923422082, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1243124327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124511 + ... + 134123.

It is an arithmetic number, because the mean of its divisors is an integer number (157261005).

Almost surely, 2^1243124321 is an apocalyptic number.

It is an amenable number.

1243124321 is a deficient number, since it is larger than the sum of its proper divisors (14963719).

1243124321 is an equidigital number, since it uses as much as digits as its factorization.

1243124321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11155.

The product of its digits is 1152, while the sum is 23.

The square root of 1243124321 is about 35257.9681916017. The cubic root of 1243124321 is about 1075.2386190324.

Adding to 1243124321 its reverse (1234213421), we get a palindrome (2477337742).

The spelling of 1243124321 in words is "one billion, two hundred forty-three million, one hundred twenty-four thousand, three hundred twenty-one".