1243231421 has 8 divisors (see below), whose sum is σ = 1307901600. Its totient is φ = 1180014640.

The previous prime is 1243231411. The next prime is 1243231447. The reversal of 1243231421 is 1241323421.

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

It is not a de Polignac number, because 1243231421 - 2²⁶ = 1176122557 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 (1243231411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 361595 + ... + 365016.

It is an arithmetic number, because the mean of its divisors is an integer number (163487700).

Almost surely, 2^1243231421 is an apocalyptic number.

It is an amenable number.

1243231421 is a deficient number, since it is larger than the sum of its proper divisors (64670179).

1243231421 is an equidigital number, since it uses as much as digits as its factorization.

1243231421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 726699.

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

The square root of 1243231421 is about 35259.4869645036. The cubic root of 1243231421 is about 1075.2694968101.

Adding to 1243231421 its reverse (1241323421), we get a palindrome (2484554842).

The spelling of 1243231421 in words is "one billion, two hundred forty-three million, two hundred thirty-one thousand, four hundred twenty-one".