21535341366 has 64 divisors (see below), whose sum is σ = 54009110016. Its totient is φ = 5561241600.

The previous prime is 21535341353. The next prime is 21535341367. The reversal of 21535341366 is 66314353512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535341367) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 54795 + ... + 214646.

It is an arithmetic number, because the mean of its divisors is an integer number (843892344).

Almost surely, 2^21535341366 is an apocalyptic number.

21535341366 is an abundant number, since it is smaller than the sum of its proper divisors (32473768650).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21535341366 is a wasteful number, since it uses less digits than its factorization.

21535341366 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269637.

The product of its digits is 194400, while the sum is 39.

Adding to 21535341366 its reverse (66314353512), we get a palindrome (87849694878).

The spelling of 21535341366 in words is "twenty-one billion, five hundred thirty-five million, three hundred forty-one thousand, three hundred sixty-six".