120047821 has 4 divisors (see below), whose sum is σ = 120204700. Its totient is φ = 119890944.

The previous prime is 120047819. The next prime is 120047857. The reversal of 120047821 is 128740021.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 128740021 = 53 ⋅2429057.

It can be written as a sum of positive squares in 2 ways, for example, as 65124900 + 54922921 = 8070^2 + 7411^2 .

It is a cyclic number.

It is not a de Polignac number, because 120047821 - 2¹ = 120047819 is a prime.

It is a super-2 number, since 2×120047821² = 28822958653696082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (120047801) 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, 77286 + ... + 78823.

It is an arithmetic number, because the mean of its divisors is an integer number (30051175).

Almost surely, 2^120047821 is an apocalyptic number.

It is an amenable number.

120047821 is a deficient number, since it is larger than the sum of its proper divisors (156879).

120047821 is an equidigital number, since it uses as much as digits as its factorization.

120047821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 156878.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 120047821 is about 10956.6336527238. The cubic root of 120047821 is about 493.3079265688.

Adding to 120047821 its reverse (128740021), we get a palindrome (248787842).

The spelling of 120047821 in words is "one hundred twenty million, forty-seven thousand, eight hundred twenty-one".