340055021 has 4 divisors (see below), whose sum is σ = 342501600. Its totient is φ = 337608444.

The previous prime is 340054993. The next prime is 340055041. The reversal of 340055021 is 120550043.

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: 120550043 = 17 ⋅7091179.

It is a cyclic number.

It is not a de Polignac number, because 340055021 - 2¹⁸ = 339792877 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340054984 and 340055002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340055041) 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, 1223081 + ... + 1223358.

It is an arithmetic number, because the mean of its divisors is an integer number (85625400).

Almost surely, 2^340055021 is an apocalyptic number.

It is an amenable number.

340055021 is a deficient number, since it is larger than the sum of its proper divisors (2446579).

340055021 is a wasteful number, since it uses less digits than its factorization.

340055021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2446578.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 340055021 is about 18440.5808205707. The cubic root of 340055021 is about 697.9908517614.

The spelling of 340055021 in words is "three hundred forty million, fifty-five thousand, twenty-one".