120305821 has 4 divisors (see below), whose sum is σ = 127382652. Its totient is φ = 113228992.

The previous prime is 120305819. The next prime is 120305851. The reversal of 120305821 is 128503021.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128503021 = 757 ⋅169753.

It can be written as a sum of positive squares in 2 ways, for example, as 45292900 + 75012921 = 6730^2 + 8661^2 .

It is a cyclic number.

It is not a de Polignac number, because 120305821 - 2¹ = 120305819 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 120305792 and 120305801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120305851) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3538390 + ... + 3538423.

It is an arithmetic number, because the mean of its divisors is an integer number (31845663).

Almost surely, 2^120305821 is an apocalyptic number.

It is an amenable number.

120305821 is a deficient number, since it is larger than the sum of its proper divisors (7076831).

120305821 is an equidigital number, since it uses as much as digits as its factorization.

120305821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7076830.

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 120305821 is about 10968.4010229386. The cubic root of 120305821 is about 493.6610702199.

Adding to 120305821 its reverse (128503021), we get a palindrome (248808842).

The spelling of 120305821 in words is "one hundred twenty million, three hundred five thousand, eight hundred twenty-one".