13021240 has 32 divisors (see below), whose sum is σ = 30245760. Its totient is φ = 5040000.

The previous prime is 13021219. The next prime is 13021247. The reversal of 13021240 is 4212031.

It is a super-2 number, since 2×13021240² = 339105382275200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 13021240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13021247) 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, 4011 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (945180).

Almost surely, 2^13021240 is an apocalyptic number.

13021240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13021240 is an abundant number, since it is smaller than the sum of its proper divisors (17224520).

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

13021240 is a wasteful number, since it uses less digits than its factorization.

13021240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10543 (or 10539 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 13.

The square root of 13021240 is about 3608.4955313815. The cubic root of 13021240 is about 235.2614563979.

Adding to 13021240 its reverse (4212031), we get a palindrome (17233271).

The spelling of 13021240 in words is "thirteen million, twenty-one thousand, two hundred forty".