20313120321 has 24 divisors (see below), whose sum is σ = 32333036736. Its totient is φ = 12209672160.

The previous prime is 20313120299. The next prime is 20313120329. The reversal of 20313120321 is 12302131302.

20313120321 is a `hidden beast` number, since 2 + 0 + 31 + 312 + 0 + 321 = 666.

It is not a de Polignac number, because 20313120321 - 2⁶ = 20313120257 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 20313120294 and 20313120303.

It is not an unprimeable number, because it can be changed into a prime (20313120329) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2013765 + ... + 2023826.

It is an arithmetic number, because the mean of its divisors is an integer number (1347209864).

Almost surely, 2^20313120321 is an apocalyptic number.

It is an amenable number.

20313120321 is a deficient number, since it is larger than the sum of its proper divisors (12019916415).

20313120321 is a wasteful number, since it uses less digits than its factorization.

20313120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037653 (or 4037650 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 20313120321 its reverse (12302131302), we get a palindrome (32615251623).

The spelling of 20313120321 in words is "twenty billion, three hundred thirteen million, one hundred twenty thousand, three hundred twenty-one".