340400221 has 4 divisors (see below), whose sum is σ = 389028832. Its totient is φ = 291771612.

The previous prime is 340400213. The next prime is 340400227. The reversal of 340400221 is 122004043.

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 340400221 - 2³ = 340400213 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 340400195 and 340400204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340400227) 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, 24314295 + ... + 24314308.

It is an arithmetic number, because the mean of its divisors is an integer number (97257208).

Almost surely, 2^340400221 is an apocalyptic number.

It is an amenable number.

340400221 is a deficient number, since it is larger than the sum of its proper divisors (48628611).

340400221 is an equidigital number, since it uses as much as digits as its factorization.

340400221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48628610.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 340400221 is about 18449.9382383790. The cubic root of 340400221 is about 698.2269556686.

Adding to 340400221 its reverse (122004043), we get a palindrome (462404264).

The spelling of 340400221 in words is "three hundred forty million, four hundred thousand, two hundred twenty-one".