13121500 has 96 divisors (see below), whose sum is σ = 34384896. Its totient is φ = 4276800.

The previous prime is 13121497. The next prime is 13121503. The reversal of 13121500 is 512131.

It is an interprime number because it is at equal distance from previous prime (13121497) and next prime (13121503).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13121503) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 80419 + ... + 80581.

It is an arithmetic number, because the mean of its divisors is an integer number (358176).

Almost surely, 2^13121500 is an apocalyptic number.

13121500 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 13121500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (17192448).

13121500 is an abundant number, since it is smaller than the sum of its proper divisors (21263396).

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

13121500 is a wasteful number, since it uses less digits than its factorization.

13121500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212 (or 200 counting only the distinct ones).

The product of its (nonzero) digits is 30, while the sum is 13.

The square root of 13121500 is about 3622.3611084485. The cubic root of 13121500 is about 235.8637296230.

Adding to 13121500 its reverse (512131), we get a palindrome (13633631).

The spelling of 13121500 in words is "thirteen million, one hundred twenty-one thousand, five hundred".