120016821 has 16 divisors (see below), whose sum is σ = 169962624. Its totient is φ = 75070464.

The previous prime is 120016807. The next prime is 120016837. The reversal of 120016821 is 128610021.

It is not a de Polignac number, because 120016821 - 2¹⁷ = 119885749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120016861) 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 15 ways as a sum of consecutive naturals, for example, 13696 + ... + 20678.

It is an arithmetic number, because the mean of its divisors is an integer number (10622664).

Almost surely, 2^120016821 is an apocalyptic number.

It is an amenable number.

120016821 is a deficient number, since it is larger than the sum of its proper divisors (49945803).

120016821 is a wasteful number, since it uses less digits than its factorization.

120016821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7340.

The product of its (nonzero) digits is 192, while the sum is 21.

The square root of 120016821 is about 10955.2188932946. The cubic root of 120016821 is about 493.2654605412.

Adding to 120016821 its reverse (128610021), we get a palindrome (248626842).

The spelling of 120016821 in words is "one hundred twenty million, sixteen thousand, eight hundred twenty-one".