13120320321 has 6 divisors (see below), whose sum is σ = 18951573810. Its totient is φ = 8746880208.

The previous prime is 13120320319. The next prime is 13120320373. The reversal of 13120320321 is 12302302131.

13120320321 is a `hidden beast` number, since 1 + 3 + 1 + 20 + 320 + 321 = 666.

It can be written as a sum of positive squares in only one way, i.e., 7330784400 + 5789535921 = 85620^2 + 76089^2 .

It is not a de Polignac number, because 13120320321 - 2¹ = 13120320319 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13120320294 and 13120320303.

It is not an unprimeable number, because it can be changed into a prime (13120327321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 728906676 + ... + 728906693.

It is an arithmetic number, because the mean of its divisors is an integer number (3158595635).

Almost surely, 2^13120320321 is an apocalyptic number.

It is an amenable number.

13120320321 is a deficient number, since it is larger than the sum of its proper divisors (5831253489).

13120320321 is a wasteful number, since it uses less digits than its factorization.

13120320321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1457813375 (or 1457813372 counting only the distinct ones).

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

Adding to 13120320321 its reverse (12302302131), we get a palindrome (25422622452).

The spelling of 13120320321 in words is "thirteen billion, one hundred twenty million, three hundred twenty thousand, three hundred twenty-one".