340355021 has 4 divisors (see below), whose sum is σ = 341113500. Its totient is φ = 339596544.

The previous prime is 340355017. The next prime is 340355023. The reversal of 340355021 is 120553043.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 108889225 + 231465796 = 10435^2 + 15214^2 .

It is a cyclic number.

It is not a de Polignac number, because 340355021 - 2² = 340355017 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340355023) 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, 378566 + ... + 379463.

It is an arithmetic number, because the mean of its divisors is an integer number (85278375).

Almost surely, 2^340355021 is an apocalyptic number.

It is an amenable number.

340355021 is a deficient number, since it is larger than the sum of its proper divisors (758479).

340355021 is an equidigital number, since it uses as much as digits as its factorization.

340355021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 758478.

The product of its (nonzero) digits is 1800, while the sum is 23.

The square root of 340355021 is about 18448.7132613632. The cubic root of 340355021 is about 698.1960496415.

The spelling of 340355021 in words is "three hundred forty million, three hundred fifty-five thousand, twenty-one".