12453430421 has 2 divisors, whose sum is σ = 12453430422. Its totient is φ = 12453430420.

The previous prime is 12453430411. The next prime is 12453430447. The reversal of 12453430421 is 12403435421.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 10142705521 + 2310724900 = 100711^2 + 48070^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12453430421 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12453430411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6226715210 + 6226715211.

It is an arithmetic number, because the mean of its divisors is an integer number (6226715211).

Almost surely, 2^12453430421 is an apocalyptic number.

It is an amenable number.

12453430421 is a deficient number, since it is larger than the sum of its proper divisors (1).

12453430421 is an equidigital number, since it uses as much as digits as its factorization.

12453430421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 12453430421 its reverse (12403435421), we get a palindrome (24856865842).

Subtracting from 12453430421 its reverse (12403435421), we obtain a triangular number (49995000 = T₉₉₉₉).

The spelling of 12453430421 in words is "twelve billion, four hundred fifty-three million, four hundred thirty thousand, four hundred twenty-one".