21535133205 has 8 divisors (see below), whose sum is σ = 34456213152. Its totient is φ = 11485404368.

The previous prime is 21535133177. The next prime is 21535133219. The reversal of 21535133205 is 50233153512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21535133205 - 2⁵ = 21535133173 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 717837759 + ... + 717837788.

It is an arithmetic number, because the mean of its divisors is an integer number (4307026644).

Almost surely, 2^21535133205 is an apocalyptic number.

It is an amenable number.

21535133205 is a deficient number, since it is larger than the sum of its proper divisors (12921079947).

21535133205 is a wasteful number, since it uses less digits than its factorization.

21535133205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1435675555.

The product of its (nonzero) digits is 13500, while the sum is 30.

Adding to 21535133205 its reverse (50233153512), we get a palindrome (71768286717).

The spelling of 21535133205 in words is "twenty-one billion, five hundred thirty-five million, one hundred thirty-three thousand, two hundred five".