13321520 has 40 divisors (see below), whose sum is σ = 31337280. Its totient is φ = 5265920.

The previous prime is 13321513. The next prime is 13321559. The reversal of 13321520 is 2512331.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×13321520² = 354925790220800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6185 + ... + 8055.

It is an arithmetic number, because the mean of its divisors is an integer number (783432).

Almost surely, 2^13321520 is an apocalyptic number.

13321520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13321520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15668640).

13321520 is an abundant number, since it is smaller than the sum of its proper divisors (18015760).

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

13321520 is a wasteful number, since it uses less digits than its factorization.

13321520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973 (or 1967 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 17.

The square root of 13321520 is about 3649.8657509558. The cubic root of 13321520 is about 237.0561683295.

Adding to 13321520 its reverse (2512331), we get a palindrome (15833851).

The spelling of 13321520 in words is "thirteen million, three hundred twenty-one thousand, five hundred twenty".