120543021 has 12 divisors (see below), whose sum is σ = 174321472. Its totient is φ = 80267976.

The previous prime is 120542999. The next prime is 120543029. The reversal of 120543021 is 120345021.

120543021 is a `hidden beast` number, since 120 + 543 + 0 + 2 + 1 = 666.

It is not a de Polignac number, because 120543021 - 2⁶ = 120542957 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120542985 and 120543003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120543029) 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 11 ways as a sum of consecutive naturals, for example, 780 + ... + 15546.

Almost surely, 2^120543021 is an apocalyptic number.

It is an amenable number.

120543021 is a deficient number, since it is larger than the sum of its proper divisors (53778451).

120543021 is a wasteful number, since it uses less digits than its factorization.

120543021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15680 (or 15677 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 120543021 is about 10979.2085780351. The cubic root of 120543021 is about 493.9852981796.

Adding to 120543021 its reverse (120345021), we get a palindrome (240888042).

The spelling of 120543021 in words is "one hundred twenty million, five hundred forty-three thousand, twenty-one".