21233253105 has 12 divisors (see below), whose sum is σ = 36804305460. Its totient is φ = 11324401632.

The previous prime is 21233253047. The next prime is 21233253133. The reversal of 21233253105 is 50135233212.

It is a happy number.

21233253105 is a `hidden beast` number, since 2 + 1 + 23 + 325 + 310 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 16292990736 + 4940262369 = 127644^2 + 70287^2 .

It is not a de Polignac number, because 21233253105 - 2⁸ = 21233252849 is a prime.

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, 235924990 + ... + 235925079.

It is an arithmetic number, because the mean of its divisors is an integer number (3067025455).

Almost surely, 2^21233253105 is an apocalyptic number.

It is an amenable number.

21233253105 is a deficient number, since it is larger than the sum of its proper divisors (15571052355).

21233253105 is a wasteful number, since it uses less digits than its factorization.

21233253105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471850080 (or 471850077 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 27.

Adding to 21233253105 its reverse (50135233212), we get a palindrome (71368486317).

The spelling of 21233253105 in words is "twenty-one billion, two hundred thirty-three million, two hundred fifty-three thousand, one hundred five".