21133333133 has 16 divisors (see below), whose sum is σ = 24464678400. Its totient is φ = 18065327280.

The previous prime is 21133333121. The next prime is 21133333157. The reversal of 21133333133 is 33133333112.

It is a happy number.

It is not a de Polignac number, because 21133333133 - 2³² = 16838365837 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21133330133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 692963 + ... + 722816.

It is an arithmetic number, because the mean of its divisors is an integer number (1529042400).

Almost surely, 2^21133333133 is an apocalyptic number.

21133333133 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21133333133 is a deficient number, since it is larger than the sum of its proper divisors (3331345267).

21133333133 is a wasteful number, since it uses less digits than its factorization.

21133333133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1415872.

The product of its digits is 4374, while the sum is 26.

Adding to 21133333133 its reverse (33133333112), we get a palindrome (54266666245).

The spelling of 21133333133 in words is "twenty-one billion, one hundred thirty-three million, three hundred thirty-three thousand, one hundred thirty-three".