13720121 has 8 divisors (see below), whose sum is σ = 14446080. Its totient is φ = 13004992.

The previous prime is 13720061. The next prime is 13720127. The reversal of 13720121 is 12102731.

13720121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 2^k-13720121 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13720121.

It is not an unprimeable number, because it can be changed into a prime (13720127) 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, 41 + ... + 5238.

It is an arithmetic number, because the mean of its divisors is an integer number (1805760).

Almost surely, 2^13720121 is an apocalyptic number.

It is an amenable number.

13720121 is a deficient number, since it is larger than the sum of its proper divisors (725959).

13720121 is a wasteful number, since it uses less digits than its factorization.

13720121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5415.

The product of its (nonzero) digits is 84, while the sum is 17.

The square root of 13720121 is about 3704.0681689191. The cubic root of 13720121 is about 239.3973362983.

Adding to 13720121 its reverse (12102731), we get a palindrome (25822852).

The spelling of 13720121 in words is "thirteen million, seven hundred twenty thousand, one hundred twenty-one".