21503055513105 has 12 divisors (see below), whose sum is σ = 37271962889460. Its totient is φ = 11468296273632.

The previous prime is 21503055513101. The next prime is 21503055513151. The reversal of 21503055513105 is 50131555030512.

21503055513105 is a `hidden beast` number, since 2 + 1 + 5 + 0 + 30 + 5 + 5 + 513 + 105 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 2264901591681 + 19238153921424 = 1504959^2 + 4386132^2 .

It is not a de Polignac number, because 21503055513105 - 2² = 21503055513101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21503055513105.

It is not an unprimeable number, because it can be changed into a prime (21503055513101) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238922838990 + ... + 238922839079.

It is an arithmetic number, because the mean of its divisors is an integer number (3105996907455).

Almost surely, 2^{21503055513105} is an apocalyptic number.

It is an amenable number.

21503055513105 is a deficient number, since it is larger than the sum of its proper divisors (15768907376355).

21503055513105 is a wasteful number, since it uses less digits than its factorization.

21503055513105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 477845678080 (or 477845678077 counting only the distinct ones).

The product of its (nonzero) digits is 56250, while the sum is 36.

The spelling of 21503055513105 in words is "twenty-one trillion, five hundred three billion, fifty-five million, five hundred thirteen thousand, one hundred five".