13021312 has 32 divisors (see below), whose sum is σ = 27074880. Its totient is φ = 6226176.

The previous prime is 13021277. The next prime is 13021331. The reversal of 13021312 is 21312031.

It is a tau number, because it is divible by the number of its divisors (32).

It is a junction number, because it is equal to n+sod(n) for n = 13021292 and 13021301.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 733 + ... + 5155.

It is an arithmetic number, because the mean of its divisors is an integer number (846090).

Almost surely, 2^13021312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13021312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13537440).

13021312 is an abundant number, since it is smaller than the sum of its proper divisors (14053568).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13021312 is an equidigital number, since it uses as much as digits as its factorization.

13021312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4460 (or 4448 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 13021312 is about 3608.5055078245. The cubic root of 13021312 is about 235.2618900174.

Adding to 13021312 its reverse (21312031), we get a palindrome (34333343).

The spelling of 13021312 in words is "thirteen million, twenty-one thousand, three hundred twelve".