20321223133 has 4 divisors (see below), whose sum is σ = 20322190108. Its totient is φ = 20320256160.

The previous prime is 20321223113. The next prime is 20321223151. The reversal of 20321223133 is 33132212302.

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 4771631929 + 15549591204 = 69077^2 + 124698^2 .

It is a cyclic number.

It is not a de Polignac number, because 20321223133 - 2¹³ = 20321214941 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 (20321223113) 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, 451248 + ... + 494233.

It is an arithmetic number, because the mean of its divisors is an integer number (5080547527).

Almost surely, 2^20321223133 is an apocalyptic number.

It is an amenable number.

20321223133 is a deficient number, since it is larger than the sum of its proper divisors (966975).

20321223133 is an equidigital number, since it uses as much as digits as its factorization.

20321223133 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966974.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 20321223133 its reverse (33132212302), we get a palindrome (53453435435).

The spelling of 20321223133 in words is "twenty billion, three hundred twenty-one million, two hundred twenty-three thousand, one hundred thirty-three".