344440021 has 4 divisors (see below), whose sum is σ = 345812544. Its totient is φ = 343067500.

The previous prime is 344440013. The next prime is 344440049. The reversal of 344440021 is 120044443.

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 344440021 - 2³ = 344440013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 344439974 and 344440001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (344440001) 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, 685885 + ... + 686386.

It is an arithmetic number, because the mean of its divisors is an integer number (86453136).

Almost surely, 2^344440021 is an apocalyptic number.

It is an amenable number.

344440021 is a deficient number, since it is larger than the sum of its proper divisors (1372523).

344440021 is a wasteful number, since it uses less digits than its factorization.

344440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1372522.

The product of its (nonzero) digits is 1536, while the sum is 22.

The square root of 344440021 is about 18559.0953712728. The cubic root of 344440021 is about 700.9782384136.

Adding to 344440021 its reverse (120044443), we get a palindrome (464484464).

The spelling of 344440021 in words is "three hundred forty-four million, four hundred forty thousand, twenty-one".