120721717 has 8 divisors (see below), whose sum is σ = 122947200. Its totient is φ = 118513824.

The previous prime is 120721703. The next prime is 120721747. The reversal of 120721717 is 717127021.

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-120721717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120721747) 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, 9873 + ... + 18409.

It is an arithmetic number, because the mean of its divisors is an integer number (15368400).

Almost surely, 2^120721717 is an apocalyptic number.

It is an amenable number.

120721717 is a deficient number, since it is larger than the sum of its proper divisors (2225483).

120721717 is an equidigital number, since it uses as much as digits as its factorization.

120721717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8795.

The product of its (nonzero) digits is 1372, while the sum is 28.

The square root of 120721717 is about 10987.3434914906. The cubic root of 120721717 is about 494.2292763946.

Adding to 120721717 its reverse (717127021), we get a palindrome (837848738).

The spelling of 120721717 in words is "one hundred twenty million, seven hundred twenty-one thousand, seven hundred seventeen".