340221421 has 4 divisors (see below), whose sum is σ = 345013344. Its totient is φ = 335429500.

The previous prime is 340221379. The next prime is 340221433. The reversal of 340221421 is 124122043.

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, and also an emirpimes, since its reverse is a distinct semiprime: 124122043 = 907 ⋅136849.

It is a cyclic number.

It is not a de Polignac number, because 340221421 - 2¹⁷ = 340090349 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 (340221481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2395855 + ... + 2395996.

It is an arithmetic number, because the mean of its divisors is an integer number (86253336).

Almost surely, 2^340221421 is an apocalyptic number.

It is an amenable number.

340221421 is a deficient number, since it is larger than the sum of its proper divisors (4791923).

340221421 is an equidigital number, since it uses as much as digits as its factorization.

340221421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4791922.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 340221421 is about 18445.0920572384. The cubic root of 340221421 is about 698.1046830839.

Adding to 340221421 its reverse (124122043), we get a palindrome (464343464).

The spelling of 340221421 in words is "three hundred forty million, two hundred twenty-one thousand, four hundred twenty-one".