4120821 has 8 divisors (see below), whose sum is σ = 6104960. Its totient is φ = 2747196.

The previous prime is 4120807. The next prime is 4120829. The reversal of 4120821 is 1280214.

It is not a de Polignac number, because 4120821 - 2¹¹ = 4118773 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 4120794 and 4120803.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4120829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76285 + ... + 76338.

It is an arithmetic number, because the mean of its divisors is an integer number (763120).

Almost surely, 2^4120821 is an apocalyptic number.

It is an amenable number.

4120821 is a deficient number, since it is larger than the sum of its proper divisors (1984139).

4120821 is a wasteful number, since it uses less digits than its factorization.

4120821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152632 (or 152626 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 4120821 is about 2029.9805417787. The cubic root of 4120821 is about 160.3225394691.

The spelling of 4120821 in words is "four million, one hundred twenty thousand, eight hundred twenty-one".