21000133333 has 4 divisors (see below), whose sum is σ = 21108942508. Its totient is φ = 20891324160.

The previous prime is 21000133289. The next prime is 21000133351. The reversal of 21000133333 is 33333100012.

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 7655725009 + 13344408324 = 87497^2 + 115518^2 .

It is a cyclic number.

It is not a de Polignac number, because 21000133333 - 2¹³ = 21000125141 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 21000133333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000133733) 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 3 ways as a sum of consecutive naturals, for example, 54404298 + ... + 54404683.

It is an arithmetic number, because the mean of its divisors is an integer number (5277235627).

Almost surely, 2^21000133333 is an apocalyptic number.

It is an amenable number.

21000133333 is a deficient number, since it is larger than the sum of its proper divisors (108809175).

21000133333 is a wasteful number, since it uses less digits than its factorization.

21000133333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108809174.

The product of its (nonzero) digits is 486, while the sum is 19.

Adding to 21000133333 its reverse (33333100012), we get a palindrome (54333233345).

The spelling of 21000133333 in words is "twenty-one billion, one hundred thirty-three thousand, three hundred thirty-three".