13146432421 has 2 divisors, whose sum is σ = 13146432422. Its totient is φ = 13146432420.

The previous prime is 13146432419. The next prime is 13146432433. The reversal of 13146432421 is 12423464131.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11033191521 + 2113240900 = 105039^2 + 45970^2 .

It is a cyclic number.

It is not a de Polignac number, because 13146432421 - 2¹ = 13146432419 is a prime.

Together with 13146432419, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13146432821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6573216210 + 6573216211.

It is an arithmetic number, because the mean of its divisors is an integer number (6573216211).

Almost surely, 2^13146432421 is an apocalyptic number.

It is an amenable number.

13146432421 is a deficient number, since it is larger than the sum of its proper divisors (1).

13146432421 is an equidigital number, since it uses as much as digits as its factorization.

13146432421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13824, while the sum is 31.

Adding to 13146432421 its reverse (12423464131), we get a palindrome (25569896552).

The spelling of 13146432421 in words is "thirteen billion, one hundred forty-six million, four hundred thirty-two thousand, four hundred twenty-one".