340351021 has 4 divisors (see below), whose sum is σ = 341837500. Its totient is φ = 338864544.

The previous prime is 340351019. The next prime is 340351051. The reversal of 340351021 is 120153043.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120153043 = 67 ⋅1793329.

It can be written as a sum of positive squares in 2 ways, for example, as 234549225 + 105801796 = 15315^2 + 10286^2 .

It is a cyclic number.

It is not a de Polignac number, because 340351021 - 2¹ = 340351019 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 340351021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340351051) 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, 742896 + ... + 743353.

It is an arithmetic number, because the mean of its divisors is an integer number (85459375).

Almost surely, 2^340351021 is an apocalyptic number.

It is an amenable number.

340351021 is a deficient number, since it is larger than the sum of its proper divisors (1486479).

340351021 is a wasteful number, since it uses less digits than its factorization.

340351021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1486478.

The product of its (nonzero) digits is 360, while the sum is 19.

The square root of 340351021 is about 18448.6048524001. The cubic root of 340351021 is about 698.1933144631.

The spelling of 340351021 in words is "three hundred forty million, three hundred fifty-one thousand, twenty-one".