13121712 has 60 divisors (see below), whose sum is σ = 36966384. Its totient is φ = 4344960.

The previous prime is 13121683. The next prime is 13121729. The reversal of 13121712 is 21712131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 42037 + ... + 42347.

Almost surely, 2^13121712 is an apocalyptic number.

13121712 is a gapful number since it is divisible by the number (12) 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 13121712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18483192).

13121712 is an abundant number, since it is smaller than the sum of its proper divisors (23844672).

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

13121712 is a wasteful number, since it uses less digits than its factorization.

13121712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618 (or 609 counting only the distinct ones).

The product of its digits is 84, while the sum is 18.

The square root of 13121712 is about 3622.3903710119. The cubic root of 13121712 is about 235.8649998751.

Adding to 13121712 its reverse (21712131), we get a palindrome (34833843).

The spelling of 13121712 in words is "thirteen million, one hundred twenty-one thousand, seven hundred twelve".