21344377423 has 2 divisors, whose sum is σ = 21344377424. Its totient is φ = 21344377422.

The previous prime is 21344377403. The next prime is 21344377427. The reversal of 21344377423 is 32477344312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21344377423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21344377427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10672188711 + 10672188712.

It is an arithmetic number, because the mean of its divisors is an integer number (10672188712).

Almost surely, 2^21344377423 is an apocalyptic number.

21344377423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21344377423 is an equidigital number, since it uses as much as digits as its factorization.

21344377423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 338688, while the sum is 40.

The spelling of 21344377423 in words is "twenty-one billion, three hundred forty-four million, three hundred seventy-seven thousand, four hundred twenty-three".