21300355533 has 8 divisors (see below), whose sum is σ = 29316618496. Its totient is φ = 13742164800.

The previous prime is 21300355529. The next prime is 21300355561. The reversal of 21300355533 is 33555300312.

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

It is not a de Polignac number, because 21300355533 - 2² = 21300355529 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21300355533.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300355523) 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 7 ways as a sum of consecutive naturals, for example, 114517948 + ... + 114518133.

It is an arithmetic number, because the mean of its divisors is an integer number (3664577312).

Almost surely, 2^21300355533 is an apocalyptic number.

It is an amenable number.

21300355533 is a deficient number, since it is larger than the sum of its proper divisors (8016262963).

21300355533 is a wasteful number, since it uses less digits than its factorization.

21300355533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229036115.

The product of its (nonzero) digits is 20250, while the sum is 30.

Adding to 21300355533 its reverse (33555300312), we get a palindrome (54855655845).

The spelling of 21300355533 in words is "twenty-one billion, three hundred million, three hundred fifty-five thousand, five hundred thirty-three".