1243421231 has 4 divisors (see below), whose sum is σ = 1339069032. Its totient is φ = 1147773432.

The previous prime is 1243421209. The next prime is 1243421233. The reversal of 1243421231 is 1321243421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1243421231 - 2¹⁴ = 1243404847 is a prime.

It is a super-2 number, since 2×1243421231² = 3092192715403110722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1243421197 and 1243421206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243421233) 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, 47823881 + ... + 47823906.

It is an arithmetic number, because the mean of its divisors is an integer number (334767258).

Almost surely, 2^1243421231 is an apocalyptic number.

1243421231 is a deficient number, since it is larger than the sum of its proper divisors (95647801).

1243421231 is an equidigital number, since it uses as much as digits as its factorization.

1243421231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95647800.

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

The square root of 1243421231 is about 35262.1784777969. The cubic root of 1243421231 is about 1075.3242161792.

Adding to 1243421231 its reverse (1321243421), we get a palindrome (2564664652).

The spelling of 1243421231 in words is "one billion, two hundred forty-three million, four hundred twenty-one thousand, two hundred thirty-one".