21432413423 has 2 divisors, whose sum is σ = 21432413424. Its totient is φ = 21432413422.

The previous prime is 21432413411. The next prime is 21432413441. The reversal of 21432413423 is 32431423412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21432413423 - 2⁴ = 21432413407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21432413323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10716206711 + 10716206712.

It is an arithmetic number, because the mean of its divisors is an integer number (10716206712).

Almost surely, 2^21432413423 is an apocalyptic number.

21432413423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21432413423 is an equidigital number, since it uses as much as digits as its factorization.

21432413423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13824, while the sum is 29.

Adding to 21432413423 its reverse (32431423412), we get a palindrome (53863836835).

The spelling of 21432413423 in words is "twenty-one billion, four hundred thirty-two million, four hundred thirteen thousand, four hundred twenty-three".