21230312133 has 8 divisors (see below), whose sum is σ = 28307757088. Its totient is φ = 14153204304.

The previous prime is 21230312107. The next prime is 21230312209. The reversal of 21230312133 is 33121303212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21230312133 - 2⁵ = 21230312101 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 (21230312333) 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 7 ways as a sum of consecutive naturals, for example, 192735 + ... + 282147.

It is an arithmetic number, because the mean of its divisors is an integer number (3538469636).

Almost surely, 2^21230312133 is an apocalyptic number.

It is an amenable number.

21230312133 is a deficient number, since it is larger than the sum of its proper divisors (7077444955).

21230312133 is an equidigital number, since it uses as much as digits as its factorization.

21230312133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168563.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21230312133 its reverse (33121303212), we get a palindrome (54351615345).

The spelling of 21230312133 in words is "twenty-one billion, two hundred thirty million, three hundred twelve thousand, one hundred thirty-three".