21533454355305 has 16 divisors (see below), whose sum is σ = 34925493093120. Its totient is φ = 11327186947968.

The previous prime is 21533454355253. The next prime is 21533454355327. The reversal of 21533454355305 is 50355345433512.

It is not a de Polignac number, because 21533454355305 - 2¹⁵ = 21533454322537 is a prime.

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, 9832626465 + ... + 9832628654.

It is an arithmetic number, because the mean of its divisors is an integer number (2182843318320).

Almost surely, 2^{21533454355305} is an apocalyptic number.

It is an amenable number.

21533454355305 is a deficient number, since it is larger than the sum of its proper divisors (13392038737815).

21533454355305 is a wasteful number, since it uses less digits than its factorization.

21533454355305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19665255200.

The product of its (nonzero) digits is 8100000, while the sum is 48.

Adding to 21533454355305 its reverse (50355345433512), we get a palindrome (71888799788817).

The spelling of 21533454355305 in words is "twenty-one trillion, five hundred thirty-three billion, four hundred fifty-four million, three hundred fifty-five thousand, three hundred five".