Adding to 13120021 its reverse (12002131), we get a palindrome (25122152).
It is a sphenic number, since it is the product of 3 distinct primes.
It is a cyclic number.
It is a de Polignac number, because none of the positive numbers 2k-13120021 is a prime.
It is a Duffinian number.
It is a congruent number.
Almost surely, 213120021 is an apocalyptic number.
It is an amenable number.
13120021 is a wasteful number, since it uses less digits than its factorization.
13120021 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 731.
The square root of 13120021 is about 3622.1569540814. The cubic root of 13120021 is about 235.8548674359.
The spelling of 13120021 in words is "thirteen million, one hundred twenty thousand, twenty-one".