21333133205 has 4 divisors (see below), whose sum is σ = 25599759852. Its totient is φ = 17066506560.

The previous prime is 21333133193. The next prime is 21333133231. The reversal of 21333133205 is 50233133312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9135918724 + 12197214481 = 95582^2 + 110441^2 .

It is not a de Polignac number, because 21333133205 - 2¹⁶ = 21333067669 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2133313316 + ... + 2133313325.

It is an arithmetic number, because the mean of its divisors is an integer number (6399939963).

Almost surely, 2^21333133205 is an apocalyptic number.

It is an amenable number.

21333133205 is a deficient number, since it is larger than the sum of its proper divisors (4266626647).

21333133205 is an equidigital number, since it uses as much as digits as its factorization.

21333133205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4266626646.

The product of its (nonzero) digits is 4860, while the sum is 26.

Adding to 21333133205 its reverse (50233133312), we get a palindrome (71566266517).

The spelling of 21333133205 in words is "twenty-one billion, three hundred thirty-three million, one hundred thirty-three thousand, two hundred five".