1344440021 has 8 divisors (see below), whose sum is σ = 1399025760. Its totient is φ = 1290914352.

The previous prime is 1344440003. The next prime is 1344440033. The reversal of 1344440021 is 1200444431.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1344440021 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 (1344445021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 262430 + ... + 267503.

It is an arithmetic number, because the mean of its divisors is an integer number (174878220).

Almost surely, 2^1344440021 is an apocalyptic number.

It is an amenable number.

1344440021 is a deficient number, since it is larger than the sum of its proper divisors (54585739).

1344440021 is an equidigital number, since it uses as much as digits as its factorization.

1344440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530035.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1344440021 is about 36666.6063469201. The cubic root of 1344440021 is about 1103.6900923892.

Adding to 1344440021 its reverse (1200444431), we get a palindrome (2544884452).

The spelling of 1344440021 in words is "one billion, three hundred forty-four million, four hundred forty thousand, twenty-one".