1243323432421 has 4 divisors (see below), whose sum is σ = 1420941065632. Its totient is φ = 1065705799212.

The previous prime is 1243323432413. The next prime is 1243323432433. The reversal of 1243323432421 is 1242343233421.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1243323432421 - 2³ = 1243323432413 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 (1243323432451) 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, 88808816595 + ... + 88808816608.

It is an arithmetic number, because the mean of its divisors is an integer number (355235266408).

Almost surely, 2^{1243323432421} is an apocalyptic number.

It is an amenable number.

1243323432421 is a deficient number, since it is larger than the sum of its proper divisors (177617633211).

1243323432421 is an equidigital number, since it uses as much as digits as its factorization.

1243323432421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177617633210.

The product of its digits is 82944, while the sum is 34.

Adding to 1243323432421 its reverse (1242343233421), we get a palindrome (2485666665842).

The spelling of 1243323432421 in words is "one trillion, two hundred forty-three billion, three hundred twenty-three million, four hundred thirty-two thousand, four hundred twenty-one".