13031213321 has 6 divisors (see below), whose sum is σ = 15158758410. Its totient is φ = 11169611376.

The previous prime is 13031213317. The next prime is 13031213323. The reversal of 13031213321 is 12331213031.

It can be written as a sum of positive squares in only one way, i.e., 12306796096 + 724417225 = 110936^2 + 26915^2 .

It is not a de Polignac number, because 13031213321 - 2² = 13031213317 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13031213293 and 13031213302.

It is not an unprimeable number, because it can be changed into a prime (13031213323) 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, 132971516 + ... + 132971613.

It is an arithmetic number, because the mean of its divisors is an integer number (2526459735).

Almost surely, 2^13031213321 is an apocalyptic number.

It is an amenable number.

13031213321 is a deficient number, since it is larger than the sum of its proper divisors (2127545089).

13031213321 is an equidigital number, since it uses as much as digits as its factorization.

13031213321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 265943143 (or 265943136 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 13031213321 its reverse (12331213031), we get a palindrome (25362426352).

The spelling of 13031213321 in words is "thirteen billion, thirty-one million, two hundred thirteen thousand, three hundred twenty-one".