21123635033305 has 64 divisors (see below), whose sum is σ = 31841164800000. Its totient is φ = 13162635193344.

The previous prime is 21123635033297. The next prime is 21123635033321. The reversal of 21123635033305 is 50333053632112.

It is not a de Polignac number, because 21123635033305 - 2³ = 21123635033297 is a prime.

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 63 ways as a sum of consecutive naturals, for example, 2868696 + ... + 7104694.

It is an arithmetic number, because the mean of its divisors is an integer number (497518200000).

Almost surely, 2^{21123635033305} is an apocalyptic number.

It is an amenable number.

21123635033305 is a deficient number, since it is larger than the sum of its proper divisors (10717529766695).

21123635033305 is an equidigital number, since it uses as much as digits as its factorization.

21123635033305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4236091 (or 4236057 counting only the distinct ones).

The product of its (nonzero) digits is 145800, while the sum is 37.

Adding to 21123635033305 its reverse (50333053632112), we get a palindrome (71456688665417).

The spelling of 21123635033305 in words is "twenty-one trillion, one hundred twenty-three billion, six hundred thirty-five million, thirty-three thousand, three hundred five".