340234021 has 4 divisors (see below), whose sum is σ = 351209344. Its totient is φ = 329258700.

The previous prime is 340234019. The next prime is 340234043. The reversal of 340234021 is 120432043.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120432043 = 4691 ⋅25673.

It is a cyclic number.

It is not a de Polignac number, because 340234021 - 2¹ = 340234019 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 340234021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340234001) 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, 5487615 + ... + 5487676.

It is an arithmetic number, because the mean of its divisors is an integer number (87802336).

Almost surely, 2^340234021 is an apocalyptic number.

340234021 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

340234021 is a deficient number, since it is larger than the sum of its proper divisors (10975323).

340234021 is a wasteful number, since it uses less digits than its factorization.

340234021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10975322.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 340234021 is about 18445.4336083487. The cubic root of 340234021 is about 698.1133010112.

Adding to 340234021 its reverse (120432043), we get a palindrome (460666064).

The spelling of 340234021 in words is "three hundred forty million, two hundred thirty-four thousand, twenty-one".