340315221 has 4 divisors (see below), whose sum is σ = 453753632. Its totient is φ = 226876812.

The previous prime is 340315187. The next prime is 340315223. The reversal of 340315221 is 122513043.

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 not a de Polignac number, because 340315221 - 2⁷ = 340315093 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340315223) 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, 56719201 + ... + 56719206.

It is an arithmetic number, because the mean of its divisors is an integer number (113438408).

Almost surely, 2^340315221 is an apocalyptic number.

It is an amenable number.

340315221 is a deficient number, since it is larger than the sum of its proper divisors (113438411).

340315221 is a wasteful number, since it uses less digits than its factorization.

340315221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 113438410.

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 340315221 is about 18447.6345638133. The cubic root of 340315221 is about 698.1688336618.

Adding to 340315221 its reverse (122513043), we get a palindrome (462828264).

The spelling of 340315221 in words is "three hundred forty million, three hundred fifteen thousand, two hundred twenty-one".