21392126405 has 32 divisors (see below), whose sum is σ = 28297237248. Its totient is φ = 15428851200.

The previous prime is 21392126401. The next prime is 21392126407. The reversal of 21392126405 is 50462129312.

It is not a de Polignac number, because 21392126405 - 2² = 21392126401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21392126401) 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 in 31 ways as a sum of consecutive naturals, for example, 472145 + ... + 515465.

It is an arithmetic number, because the mean of its divisors is an integer number (884288664).

Almost surely, 2^21392126405 is an apocalyptic number.

It is an amenable number.

21392126405 is a deficient number, since it is larger than the sum of its proper divisors (6905110843).

21392126405 is a wasteful number, since it uses less digits than its factorization.

21392126405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43517.

The product of its (nonzero) digits is 25920, while the sum is 35.

The spelling of 21392126405 in words is "twenty-one billion, three hundred ninety-two million, one hundred twenty-six thousand, four hundred five".