20123335321 has 4 divisors (see below), whose sum is σ = 20127717412. Its totient is φ = 20118953232.

The previous prime is 20123335289. The next prime is 20123335343. The reversal of 20123335321 is 12353332102.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 12353332102 = 2 ⋅6176666051.

It can be written as a sum of positive squares in 2 ways, for example, as 9153705625 + 10969629696 = 95675^2 + 104736^2 .

It is a cyclic number.

It is not a de Polignac number, because 20123335321 - 2⁵ = 20123335289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20123335361) 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, 2184150 + ... + 2193343.

It is an arithmetic number, because the mean of its divisors is an integer number (5031929353).

Almost surely, 2^20123335321 is an apocalyptic number.

It is an amenable number.

20123335321 is a deficient number, since it is larger than the sum of its proper divisors (4382091).

20123335321 is an equidigital number, since it uses as much as digits as its factorization.

20123335321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4382090.

The product of its (nonzero) digits is 3240, while the sum is 25.

Adding to 20123335321 its reverse (12353332102), we get a palindrome (32476667423).

It can be divided in two parts, 2012 and 3335321, that added together give a palindrome (3337333).

The spelling of 20123335321 in words is "twenty billion, one hundred twenty-three million, three hundred thirty-five thousand, three hundred twenty-one".