13121321321 has 8 divisors (see below), whose sum is σ = 13814734080. Its totient is φ = 12428190288.

The previous prime is 13121321287. The next prime is 13121321329. The reversal of 13121321321 is 12312312131.

It is a happy number.

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 13121321321 - 2²² = 13117127017 is a prime.

It is a super-3 number, since 3×13121321321³ (a number of 31 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13121321293 and 13121321302.

It is not an unprimeable number, because it can be changed into a prime (13121321329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28775 + ... + 164531.

It is an arithmetic number, because the mean of its divisors is an integer number (1726841760).

Almost surely, 2^13121321321 is an apocalyptic number.

It is an amenable number.

13121321321 is a deficient number, since it is larger than the sum of its proper divisors (693412759).

13121321321 is a wasteful number, since it uses less digits than its factorization.

13121321321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140863.

The product of its digits is 216, while the sum is 20.

Adding to 13121321321 its reverse (12312312131), we get a palindrome (25433633452).

The spelling of 13121321321 in words is "thirteen billion, one hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-one".