21434021105 has 16 divisors (see below), whose sum is σ = 29401048704. Its totient is φ = 14694704640.

The previous prime is 21434021051. The next prime is 21434021111. The reversal of 21434021105 is 50112043412.

It is not a de Polignac number, because 21434021105 - 2⁸ = 21434020849 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 126854 + ... + 242816.

It is an arithmetic number, because the mean of its divisors is an integer number (1837565544).

Almost surely, 2^21434021105 is an apocalyptic number.

It is an amenable number.

21434021105 is a deficient number, since it is larger than the sum of its proper divisors (7967027599).

21434021105 is a wasteful number, since it uses less digits than its factorization.

21434021105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121256.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 21434021105 its reverse (50112043412), we get a palindrome (71546064517).

The spelling of 21434021105 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, one hundred five".