20133212321 has 4 divisors (see below), whose sum is σ = 20463265044. Its totient is φ = 19803159600.

The previous prime is 20133212299. The next prime is 20133212327. The reversal of 20133212321 is 12321233102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12321233102 = 2 ⋅6160616551.

It can be written as a sum of positive squares in 2 ways, for example, as 206784400 + 19926427921 = 14380^2 + 141161^2 .

It is a cyclic number.

It is not a de Polignac number, because 20133212321 - 2²² = 20129018017 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20133212293 and 20133212302.

It is not an unprimeable number, because it can be changed into a prime (20133212327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 165026270 + ... + 165026391.

It is an arithmetic number, because the mean of its divisors is an integer number (5115816261).

Almost surely, 2^20133212321 is an apocalyptic number.

It is an amenable number.

20133212321 is a deficient number, since it is larger than the sum of its proper divisors (330052723).

20133212321 is an equidigital number, since it uses as much as digits as its factorization.

20133212321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330052722.

The product of its (nonzero) digits is 432, while the sum is 20.

Adding to 20133212321 its reverse (12321233102), we get a palindrome (32454445423).

The spelling of 20133212321 in words is "twenty billion, one hundred thirty-three million, two hundred twelve thousand, three hundred twenty-one".