21302013133 has 4 divisors (see below), whose sum is σ = 22036565340. Its totient is φ = 20567460928.

The previous prime is 21302013113. The next prime is 21302013137. The reversal of 21302013133 is 33131020312.

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 17683148484 + 3618864649 = 132978^2 + 60157^2 .

It is a cyclic number.

It is not a de Polignac number, because 21302013133 - 2⁵ = 21302013101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21302013133.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21302013137) 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, 367276060 + ... + 367276117.

It is an arithmetic number, because the mean of its divisors is an integer number (5509141335).

Almost surely, 2^21302013133 is an apocalyptic number.

It is an amenable number.

21302013133 is a deficient number, since it is larger than the sum of its proper divisors (734552207).

21302013133 is an equidigital number, since it uses as much as digits as its factorization.

21302013133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734552206.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21302013133 its reverse (33131020312), we get a palindrome (54433033445).

The spelling of 21302013133 in words is "twenty-one billion, three hundred two million, thirteen thousand, one hundred thirty-three".