120136821 has 16 divisors (see below), whose sum is σ = 189379200. Its totient is φ = 66282048.

The previous prime is 120136777. The next prime is 120136931. The reversal of 120136821 is 128631021.

It is not a de Polignac number, because 120136821 - 2⁷ = 120136693 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 120136791 and 120136800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120136021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 98026 + ... + 99243.

It is an arithmetic number, because the mean of its divisors is an integer number (11836200).

Almost surely, 2^120136821 is an apocalyptic number.

It is an amenable number.

120136821 is a deficient number, since it is larger than the sum of its proper divisors (69242379).

120136821 is a wasteful number, since it uses less digits than its factorization.

120136821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 197308.

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 120136821 is about 10960.6943666905. The cubic root of 120136821 is about 493.4298045552.

Adding to 120136821 its reverse (128631021), we get a palindrome (248767842).

The spelling of 120136821 in words is "one hundred twenty million, one hundred thirty-six thousand, eight hundred twenty-one".