21355334105 has 24 divisors (see below), whose sum is σ = 29826908928. Its totient is φ = 14635500768.

The previous prime is 21355333999. The next prime is 21355334137. The reversal of 21355334105 is 50143355312.

It is not a de Polignac number, because 21355334105 - 2¹⁸ = 21355071961 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 (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 434072 + ... + 480758.

It is an arithmetic number, because the mean of its divisors is an integer number (1242787872).

Almost surely, 2^21355334105 is an apocalyptic number.

It is an amenable number.

21355334105 is a deficient number, since it is larger than the sum of its proper divisors (8471574823).

21355334105 is a wasteful number, since it uses less digits than its factorization.

21355334105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48573 (or 48566 counting only the distinct ones).

The product of its (nonzero) digits is 27000, while the sum is 32.

Adding to 21355334105 its reverse (50143355312), we get a palindrome (71498689417).

The spelling of 21355334105 in words is "twenty-one billion, three hundred fifty-five million, three hundred thirty-four thousand, one hundred five".