340210421 has 4 divisors (see below), whose sum is σ = 344033100. Its totient is φ = 336387744.

The previous prime is 340210357. The next prime is 340210427. The reversal of 340210421 is 124012043.

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 187416100 + 152794321 = 13690^2 + 12361^2 .

It is a cyclic number.

It is not a de Polignac number, because 340210421 - 2⁶ = 340210357 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 340210421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340210427) 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, 1911206 + ... + 1911383.

It is an arithmetic number, because the mean of its divisors is an integer number (86008275).

Almost surely, 2^340210421 is an apocalyptic number.

It is an amenable number.

340210421 is a deficient number, since it is larger than the sum of its proper divisors (3822679).

340210421 is an equidigital number, since it uses as much as digits as its factorization.

340210421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3822678.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 340210421 is about 18444.7938725267. The cubic root of 340210421 is about 698.0971593226.

Adding to 340210421 its reverse (124012043), we get a palindrome (464222464).

The spelling of 340210421 in words is "three hundred forty million, two hundred ten thousand, four hundred twenty-one".