21331302133 has 4 divisors (see below), whose sum is σ = 21336029100. Its totient is φ = 21326575168.

The previous prime is 21331302119. The next prime is 21331302169. The reversal of 21331302133 is 33120313312.

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 1507225329 + 19824076804 = 38823^2 + 140798^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331302133 - 2¹⁷ = 21331171061 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 (21331302173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2356708 + ... + 2365741.

It is an arithmetic number, because the mean of its divisors is an integer number (5334007275).

Almost surely, 2^21331302133 is an apocalyptic number.

It is an amenable number.

21331302133 is a deficient number, since it is larger than the sum of its proper divisors (4726967).

21331302133 is an equidigital number, since it uses as much as digits as its factorization.

21331302133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726966.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21331302133 its reverse (33120313312), we get a palindrome (54451615445).

The spelling of 21331302133 in words is "twenty-one billion, three hundred thirty-one million, three hundred two thousand, one hundred thirty-three".