2306021 has 4 divisors (see below), whose sum is σ = 2309100. Its totient is φ = 2302944.

The previous prime is 2305987. The next prime is 2306023. The reversal of 2306021 is 1206032.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2044900 + 261121 = 1430^2 + 511^2 .

It is a cyclic number.

It is not a de Polignac number, because 2306021 - 2¹⁰ = 2304997 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 2305987 and 2306005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2306023) 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 3 ways as a sum of consecutive naturals, for example, 395 + ... + 2183.

It is an arithmetic number, because the mean of its divisors is an integer number (577275).

2^2306021 is an apocalyptic number.

It is an amenable number.

2306021 is a deficient number, since it is larger than the sum of its proper divisors (3079).

2306021 is a wasteful number, since it uses less digits than its factorization.

2306021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3078.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 2306021 is about 1518.5588562845. The cubic root of 2306021 is about 132.1156966962.

The spelling of 2306021 in words is "two million, three hundred six thousand, twenty-one".