21533550105 has 32 divisors (see below), whose sum is σ = 35270332416. Its totient is φ = 11212576704.

The previous prime is 21533550097. The next prime is 21533550109. The reversal of 21533550105 is 50105533512.

It is not a de Polignac number, because 21533550105 - 2³ = 21533550097 is a prime.

It is a super-2 number, since 2×21533550105² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21533550109) 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, 1827864 + ... + 1839606.

It is an arithmetic number, because the mean of its divisors is an integer number (1102197888).

Almost surely, 2^21533550105 is an apocalyptic number.

It is an amenable number.

21533550105 is a deficient number, since it is larger than the sum of its proper divisors (13736782311).

21533550105 is a wasteful number, since it uses less digits than its factorization.

21533550105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14637.

The product of its (nonzero) digits is 11250, while the sum is 30.

The spelling of 21533550105 in words is "twenty-one billion, five hundred thirty-three million, five hundred fifty thousand, one hundred five".