21133502216105 has 16 divisors (see below), whose sum is σ = 25459166543184. Its totient is φ = 16840936277760.

The previous prime is 21133502216069. The next prime is 21133502216117. The reversal of 21133502216105 is 50161220533112.

It can be written as a sum of positive squares in 8 ways, for example, as 31578711616 + 21101923504489 = 177704^2 + 4593683^2 .

It is not a de Polignac number, because 21133502216105 - 2¹⁰ = 21133502215081 is a prime.

It is a super-2 number, since 2×21133502216105² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5369954 + ... + 8432283.

It is an arithmetic number, because the mean of its divisors is an integer number (1591197908949).

Almost surely, 2^{21133502216105} is an apocalyptic number.

It is an amenable number.

21133502216105 is a deficient number, since it is larger than the sum of its proper divisors (4325664327079).

21133502216105 is a wasteful number, since it uses less digits than its factorization.

21133502216105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13803436.

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 21133502216105 its reverse (50161220533112), we get a palindrome (71294722749217).

The spelling of 21133502216105 in words is "twenty-one trillion, one hundred thirty-three billion, five hundred two million, two hundred sixteen thousand, one hundred five".