20313131221 has 8 divisors (see below), whose sum is σ = 20620556640. Its totient is φ = 20005830768.

The previous prime is 20313131219. The next prime is 20313131227. The reversal of 20313131221 is 12213131302.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20313131221 - 2¹ = 20313131219 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 (20313131227) 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 7 ways as a sum of consecutive naturals, for example, 327150 + ... + 384256.

It is an arithmetic number, because the mean of its divisors is an integer number (2577569580).

Almost surely, 2^20313131221 is an apocalyptic number.

It is an amenable number.

20313131221 is a deficient number, since it is larger than the sum of its proper divisors (307425419).

20313131221 is an equidigital number, since it uses as much as digits as its factorization.

20313131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62483.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 20313131221 its reverse (12213131302), we get a palindrome (32526262523).

The spelling of 20313131221 in words is "twenty billion, three hundred thirteen million, one hundred thirty-one thousand, two hundred twenty-one".