340242021 has 24 divisors (see below), whose sum is σ = 563214080. Its totient is φ = 193889376.

The previous prime is 340241999. The next prime is 340242031. The reversal of 340242021 is 120242043.

It is not a de Polignac number, because 340242021 - 2⁵ = 340241989 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340241985 and 340242003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340242031) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 16260 + ... + 30738.

Almost surely, 2^340242021 is an apocalyptic number.

It is an amenable number.

340242021 is a deficient number, since it is larger than the sum of its proper divisors (222972059).

340242021 is a wasteful number, since it uses less digits than its factorization.

340242021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14865 (or 14862 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 340242021 is about 18445.6504629140. The cubic root of 340242021 is about 698.1187726007.

Adding to 340242021 its reverse (120242043), we get a palindrome (460484064).

The spelling of 340242021 in words is "three hundred forty million, two hundred forty-two thousand, twenty-one".