21302320133 has 4 divisors (see below), whose sum is σ = 21303794688. Its totient is φ = 21300845580.

The previous prime is 21302320129. The next prime is 21302320139. The reversal of 21302320133 is 33102320312.

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 21302320133 - 2² = 21302320129 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 (21302320139) 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, 715391 + ... + 744572.

It is an arithmetic number, because the mean of its divisors is an integer number (5325948672).

Almost surely, 2^21302320133 is an apocalyptic number.

It is an amenable number.

21302320133 is a deficient number, since it is larger than the sum of its proper divisors (1474555).

21302320133 is a wasteful number, since it uses less digits than its factorization.

21302320133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1474554.

The product of its (nonzero) digits is 648, while the sum is 20.

Adding to 21302320133 its reverse (33102320312), we get a palindrome (54404640445).

The spelling of 21302320133 in words is "twenty-one billion, three hundred two million, three hundred twenty thousand, one hundred thirty-three".