20123313221 has 4 divisors (see below), whose sum is σ = 21952705344. Its totient is φ = 18293921100.

The previous prime is 20123313187. The next prime is 20123313271. The reversal of 20123313221 is 12231332102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20123313221 - 2²² = 20119118917 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20123313193 and 20123313202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20123313271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 914696045 + ... + 914696066.

It is an arithmetic number, because the mean of its divisors is an integer number (5488176336).

Almost surely, 2^20123313221 is an apocalyptic number.

It is an amenable number.

20123313221 is a deficient number, since it is larger than the sum of its proper divisors (1829392123).

20123313221 is a wasteful number, since it uses less digits than its factorization.

20123313221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829392122.

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

Adding to 20123313221 its reverse (12231332102), we get a palindrome (32354645323).

The spelling of 20123313221 in words is "twenty billion, one hundred twenty-three million, three hundred thirteen thousand, two hundred twenty-one".