21414435405 has 24 divisors (see below), whose sum is σ = 37661092896. Its totient is φ = 10382755680.

The previous prime is 21414435401. The next prime is 21414435421. The reversal of 21414435405 is 50453441412.

It is a happy number.

It is not a de Polignac number, because 21414435405 - 2² = 21414435401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21414435401) 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 23 ways as a sum of consecutive naturals, for example, 5897479 + ... + 5901108.

It is an arithmetic number, because the mean of its divisors is an integer number (1569212204).

Almost surely, 2^21414435405 is an apocalyptic number.

It is an amenable number.

21414435405 is a deficient number, since it is larger than the sum of its proper divisors (16246657491).

21414435405 is a wasteful number, since it uses less digits than its factorization.

21414435405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11798617 (or 11798606 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 33.

Adding to 21414435405 its reverse (50453441412), we get a palindrome (71867876817).

The spelling of 21414435405 in words is "twenty-one billion, four hundred fourteen million, four hundred thirty-five thousand, four hundred five".