21422344423 has 2 divisors, whose sum is σ = 21422344424. Its totient is φ = 21422344422.

The previous prime is 21422344393. The next prime is 21422344483. The reversal of 21422344423 is 32444322412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21422344423 - 2²¹ = 21420247271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21422344483) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711172211 + 10711172212.

It is an arithmetic number, because the mean of its divisors is an integer number (10711172212).

Almost surely, 2^21422344423 is an apocalyptic number.

21422344423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21422344423 is an equidigital number, since it uses as much as digits as its factorization.

21422344423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 36864, while the sum is 31.

Adding to 21422344423 its reverse (32444322412), we get a palindrome (53866666835).

The spelling of 21422344423 in words is "twenty-one billion, four hundred twenty-two million, three hundred forty-four thousand, four hundred twenty-three".