120216781 has 8 divisors (see below), whose sum is σ = 126890720. Its totient is φ = 113577552.

The previous prime is 120216769. The next prime is 120216823. The reversal of 120216781 is 187612021.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 120216781 - 2²¹ = 118119629 is a prime.

It is a super-2 number, since 2×120216781² = 28904148868003922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120216721) 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, 1395 + ... + 15568.

It is an arithmetic number, because the mean of its divisors is an integer number (15861340).

Almost surely, 2^120216781 is an apocalyptic number.

It is an amenable number.

120216781 is a deficient number, since it is larger than the sum of its proper divisors (6673939).

120216781 is a wasteful number, since it uses less digits than its factorization.

120216781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17355.

The product of its (nonzero) digits is 1344, while the sum is 28.

The square root of 120216781 is about 10964.3413390864. The cubic root of 120216781 is about 493.5392517026.

The spelling of 120216781 in words is "one hundred twenty million, two hundred sixteen thousand, seven hundred eighty-one".