120216555 has 20 divisors (see below), whose sum is σ = 215500032. Its totient is φ = 64115280.

The previous prime is 120216521. The next prime is 120216557. The reversal of 120216555 is 555612021.

120216555 is a `hidden beast` number, since 1 + 2 + 0 + 2 + 1 + 655 + 5 = 666.

It is not a de Polignac number, because 120216555 - 2⁶ = 120216491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (120216557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 148011 + ... + 148820.

Almost surely, 2^120216555 is an apocalyptic number.

120216555 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

120216555 is a deficient number, since it is larger than the sum of its proper divisors (95283477).

120216555 is an equidigital number, since it uses as much as digits as its factorization.

120216555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 296848 (or 296839 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

The square root of 120216555 is about 10964.3310329450. The cubic root of 120216555 is about 493.5389424282.

Adding to 120216555 its reverse (555612021), we get a palindrome (675828576).

The spelling of 120216555 in words is "one hundred twenty million, two hundred sixteen thousand, five hundred fifty-five".