340405221 has 32 divisors (see below), whose sum is σ = 512870400. Its totient is φ = 199260864.

The previous prime is 340405213. The next prime is 340405253. The reversal of 340405221 is 122504043.

It is not a de Polignac number, because 340405221 - 2³ = 340405213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340405201) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177550 + ... + 179456.

It is an arithmetic number, because the mean of its divisors is an integer number (16027200).

Almost surely, 2^340405221 is an apocalyptic number.

It is an amenable number.

340405221 is a deficient number, since it is larger than the sum of its proper divisors (172465179).

340405221 is a wasteful number, since it uses less digits than its factorization.

340405221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 340405221 is about 18450.0737396900. The cubic root of 340405221 is about 698.2303743089.

Adding to 340405221 its reverse (122504043), we get a palindrome (462909264).

The spelling of 340405221 in words is "three hundred forty million, four hundred five thousand, two hundred twenty-one".