340341021 has 20 divisors (see below), whose sum is σ = 516752764. Its totient is φ = 223171200.

The previous prime is 340341011. The next prime is 340341047. The reversal of 340341021 is 120143043.

It can be written as a sum of positive squares in 2 ways, for example, as 4901796 + 335439225 = 2214^2 + 18315^2 .

It is not a de Polignac number, because 340341021 - 2¹⁰ = 340339997 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 = 340340985 and 340341003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340341011) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 29500 + ... + 39381.

Almost surely, 2^340341021 is an apocalyptic number.

It is an amenable number.

340341021 is a deficient number, since it is larger than the sum of its proper divisors (176411743).

340341021 is an equidigital number, since it uses as much as digits as its factorization.

340341021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68954 (or 68945 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 340341021 is about 18448.3338272051. Note that the first 3 decimals coincide. The cubic root of 340341021 is about 698.1864764232.

Adding to 340341021 its reverse (120143043), we get a palindrome (460484064).

The spelling of 340341021 in words is "three hundred forty million, three hundred forty-one thousand, twenty-one".