13662120321 has 12 divisors (see below), whose sum is σ = 19801529748. Its totient is φ = 9076992864.

The previous prime is 13662120293. The next prime is 13662120337. The reversal of 13662120321 is 12302126631.

13662120321 is a `hidden beast` number, since 1 + 3 + 6 + 621 + 2 + 0 + 32 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 12867726096 + 794394225 = 113436^2 + 28185^2 .

It is not a de Polignac number, because 13662120321 - 2⁵ = 13662120289 is a prime.

It is a super-2 number, since 2×13662120321² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (13662120341) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2587830 + ... + 2593103.

It is an arithmetic number, because the mean of its divisors is an integer number (1650127479).

Almost surely, 2^13662120321 is an apocalyptic number.

It is an amenable number.

13662120321 is a deficient number, since it is larger than the sum of its proper divisors (6139409427).

13662120321 is a wasteful number, since it uses less digits than its factorization.

13662120321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5181232 (or 5181229 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

Adding to 13662120321 its reverse (12302126631), we get a palindrome (25964246952).

The spelling of 13662120321 in words is "thirteen billion, six hundred sixty-two million, one hundred twenty thousand, three hundred twenty-one".