344421721 has 16 divisors (see below), whose sum is σ = 416764800. Its totient is φ = 278045568.

The previous prime is 344421713. The next prime is 344421731. The reversal of 344421721 is 127124443.

It is a cyclic number.

It is not a de Polignac number, because 344421721 - 2³ = 344421713 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 344421721.

It is not an unprimeable number, because it can be changed into a prime (344421731) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15525 + ... + 30493.

It is an arithmetic number, because the mean of its divisors is an integer number (26047800).

Almost surely, 2^344421721 is an apocalyptic number.

It is an amenable number.

344421721 is a deficient number, since it is larger than the sum of its proper divisors (72343079).

344421721 is a wasteful number, since it uses less digits than its factorization.

344421721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15168.

The product of its digits is 5376, while the sum is 28.

The square root of 344421721 is about 18558.6023450043. The cubic root of 344421721 is about 700.9658239359.

It can be divided in two parts, 34442 and 1721, that added together give a palindrome (36163).

The spelling of 344421721 in words is "three hundred forty-four million, four hundred twenty-one thousand, seven hundred twenty-one".