21103533311205 has 16 divisors (see below), whose sum is σ = 33861306715200. Its totient is φ = 11223333293568.

The previous prime is 21103533311171. The next prime is 21103533311213. The reversal of 21103533311205 is 50211333530112.

It is not a de Polignac number, because 21103533311205 - 2²⁹ = 21102996440293 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1992774055 + ... + 1992784644.

It is an arithmetic number, because the mean of its divisors is an integer number (2116331669700).

Almost surely, 2^{21103533311205} is an apocalyptic number.

It is an amenable number.

21103533311205 is a deficient number, since it is larger than the sum of its proper divisors (12757773403995).

21103533311205 is a wasteful number, since it uses less digits than its factorization.

21103533311205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985559060.

The product of its (nonzero) digits is 8100, while the sum is 30.

Adding to 21103533311205 its reverse (50211333530112), we get a palindrome (71314866841317).

The spelling of 21103533311205 in words is "twenty-one trillion, one hundred three billion, five hundred thirty-three million, three hundred eleven thousand, two hundred five".