21320210133 has 6 divisors (see below), whose sum is σ = 30795859094. Its totient is φ = 14213473416.

The previous prime is 21320210117. The next prime is 21320210209. The reversal of 21320210133 is 33101202312.

21320210133 is a `hidden beast` number, since 2 + 1 + 320 + 210 + 133 = 666.

It can be written as a sum of positive squares in only one way, i.e., 18676502244 + 2643707889 = 136662^2 + 51417^2 .

It is not a de Polignac number, because 21320210133 - 2⁴ = 21320210117 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 (21320210113) 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 5 ways as a sum of consecutive naturals, for example, 1184456110 + ... + 1184456127.

Almost surely, 2^21320210133 is an apocalyptic number.

It is an amenable number.

21320210133 is a deficient number, since it is larger than the sum of its proper divisors (9475648961).

21320210133 is a wasteful number, since it uses less digits than its factorization.

21320210133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2368912243 (or 2368912240 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 21320210133 its reverse (33101202312), we get a palindrome (54421412445).

The spelling of 21320210133 in words is "twenty-one billion, three hundred twenty million, two hundred ten thousand, one hundred thirty-three".