21233053305 has 12 divisors (see below), whose sum is σ = 36803959140. Its totient is φ = 11324295072.

The previous prime is 21233053273. The next prime is 21233053321. The reversal of 21233053305 is 50335033212.

21233053305 is a `hidden beast` number, since 2 + 1 + 23 + 305 + 330 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 10600143849 + 10632909456 = 102957^2 + 103116^2 .

It is not a de Polignac number, because 21233053305 - 2⁵ = 21233053273 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 235922770 + ... + 235922859.

It is an arithmetic number, because the mean of its divisors is an integer number (3066996595).

Almost surely, 2^21233053305 is an apocalyptic number.

It is an amenable number.

21233053305 is a deficient number, since it is larger than the sum of its proper divisors (15570905835).

21233053305 is a wasteful number, since it uses less digits than its factorization.

21233053305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471845640 (or 471845637 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 27.

Adding to 21233053305 its reverse (50335033212), we get a palindrome (71568086517).

The spelling of 21233053305 in words is "twenty-one billion, two hundred thirty-three million, fifty-three thousand, three hundred five".