20313123221 has 4 divisors (see below), whose sum is σ = 20314582944. Its totient is φ = 20311663500.

The previous prime is 20313123191. The next prime is 20313123239. The reversal of 20313123221 is 12232131302.

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 20313123221 - 2¹⁴ = 20313106837 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20313123193 and 20313123202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20313123121) 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, 708785 + ... + 736886.

It is an arithmetic number, because the mean of its divisors is an integer number (5078645736).

Almost surely, 2^20313123221 is an apocalyptic number.

It is an amenable number.

20313123221 is a deficient number, since it is larger than the sum of its proper divisors (1459723).

20313123221 is a wasteful number, since it uses less digits than its factorization.

20313123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1459722.

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

Adding to 20313123221 its reverse (12232131302), we get a palindrome (32545254523).

The spelling of 20313123221 in words is "twenty billion, three hundred thirteen million, one hundred twenty-three thousand, two hundred twenty-one".