21001333133 has 16 divisors (see below), whose sum is σ = 23158544640. Its totient is φ = 18885657600.

The previous prime is 21001333127. The next prime is 21001333159. The reversal of 21001333133 is 33133310012.

It is a cyclic number.

It is not a de Polignac number, because 21001333133 - 2¹⁶ = 21001267597 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001333103) 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 15 ways as a sum of consecutive naturals, for example, 2846273 + ... + 2853641.

It is an arithmetic number, because the mean of its divisors is an integer number (1447409040).

Almost surely, 2^21001333133 is an apocalyptic number.

It is an amenable number.

21001333133 is a deficient number, since it is larger than the sum of its proper divisors (2157211507).

21001333133 is a wasteful number, since it uses less digits than its factorization.

21001333133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10148.

The product of its (nonzero) digits is 486, while the sum is 20.

Adding to 21001333133 its reverse (33133310012), we get a palindrome (54134643145).

The spelling of 21001333133 in words is "twenty-one billion, one million, three hundred thirty-three thousand, one hundred thirty-three".