340661221 has 4 divisors (see below), whose sum is σ = 346435200. Its totient is φ = 334887244.

The previous prime is 340661219. The next prime is 340661261. The reversal of 340661221 is 122166043.

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.

It is a cyclic number.

It is not a de Polignac number, because 340661221 - 2¹ = 340661219 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340661261) 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, 2886901 + ... + 2887018.

It is an arithmetic number, because the mean of its divisors is an integer number (86608800).

Almost surely, 2^340661221 is an apocalyptic number.

It is an amenable number.

340661221 is a deficient number, since it is larger than the sum of its proper divisors (5773979).

340661221 is an equidigital number, since it uses as much as digits as its factorization.

340661221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5773978.

The product of its (nonzero) digits is 1728, while the sum is 25.

The square root of 340661221 is about 18457.0100774746. The cubic root of 340661221 is about 698.4053639731.

The spelling of 340661221 in words is "three hundred forty million, six hundred sixty-one thousand, two hundred twenty-one".