21404345383 has 2 divisors, whose sum is σ = 21404345384. Its totient is φ = 21404345382.

The previous prime is 21404345299. The next prime is 21404345387. The reversal of 21404345383 is 38354340412.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21404345383 - 2¹³ = 21404337191 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21404345387) 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, 10702172691 + 10702172692.

It is an arithmetic number, because the mean of its divisors is an integer number (10702172692).

Almost surely, 2^21404345383 is an apocalyptic number.

21404345383 is a deficient number, since it is larger than the sum of its proper divisors (1).

21404345383 is an equidigital number, since it uses as much as digits as its factorization.

21404345383 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 138240, while the sum is 37.

Adding to 21404345383 its reverse (38354340412), we get a palindrome (59758685795).

The spelling of 21404345383 in words is "twenty-one billion, four hundred four million, three hundred forty-five thousand, three hundred eighty-three".