21333331133 has 4 divisors (see below), whose sum is σ = 21522121788. Its totient is φ = 21144540480.

The previous prime is 21333331111. The next prime is 21333331177. The reversal of 21333331133 is 33113333312.

It is a happy number.

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 9643829209 + 11689501924 = 98203^2 + 108118^2 .

It is a cyclic number.

It is not a de Polignac number, because 21333331133 - 2⁶ = 21333331069 is a prime.

It is a super-2 number, since 2×21333331133² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21333331633) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 94395158 + ... + 94395383.

It is an arithmetic number, because the mean of its divisors is an integer number (5380530447).

Almost surely, 2^21333331133 is an apocalyptic number.

It is an amenable number.

21333331133 is a deficient number, since it is larger than the sum of its proper divisors (188790655).

21333331133 is a wasteful number, since it uses less digits than its factorization.

21333331133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188790654.

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

Adding to 21333331133 its reverse (33113333312), we get a palindrome (54446664445).

The spelling of 21333331133 in words is "twenty-one billion, three hundred thirty-three million, three hundred thirty-one thousand, one hundred thirty-three".