21303130133 has 4 divisors (see below), whose sum is σ = 21798551808. Its totient is φ = 20807708460.

The previous prime is 21303130067. The next prime is 21303130141. The reversal of 21303130133 is 33103130312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21303130133 - 2¹⁰ = 21303129109 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21303130153) 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, 247710773 + ... + 247710858.

It is an arithmetic number, because the mean of its divisors is an integer number (5449637952).

Almost surely, 2^21303130133 is an apocalyptic number.

It is an amenable number.

21303130133 is a deficient number, since it is larger than the sum of its proper divisors (495421675).

21303130133 is an equidigital number, since it uses as much as digits as its factorization.

21303130133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495421674.

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

Adding to 21303130133 its reverse (33103130312), we get a palindrome (54406260445).

The spelling of 21303130133 in words is "twenty-one billion, three hundred three million, one hundred thirty thousand, one hundred thirty-three".