21235435353 has 24 divisors (see below), whose sum is σ = 33526205856. Its totient is φ = 12845227200.

The previous prime is 21235435283. The next prime is 21235435357. The reversal of 21235435353 is 35353453212.

21235435353 is a `hidden beast` number, since 2 + 12 + 3 + 543 + 53 + 53 = 666.

It is not a de Polignac number, because 21235435353 - 2⁹ = 21235434841 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (21235435357) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154275 + ... + 257432.

It is an arithmetic number, because the mean of its divisors is an integer number (1396925244).

Almost surely, 2^21235435353 is an apocalyptic number.

It is an amenable number.

21235435353 is a deficient number, since it is larger than the sum of its proper divisors (12290770503).

21235435353 is a wasteful number, since it uses less digits than its factorization.

21235435353 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412245 (or 412242 counting only the distinct ones).

The product of its digits is 162000, while the sum is 36.

Adding to 21235435353 its reverse (35353453212), we get a palindrome (56588888565).

The spelling of 21235435353 in words is "twenty-one billion, two hundred thirty-five million, four hundred thirty-five thousand, three hundred fifty-three".