1340144221 has 8 divisors (see below), whose sum is σ = 1528128504. Its totient is φ = 1164288000.

The previous prime is 1340144191. The next prime is 1340144237. The reversal of 1340144221 is 1224410431.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 106378596 + 1233765625 = 10314^2 + 35125^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 1340144221 - 2¹⁵ = 1340111453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340144192 and 1340144201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340144521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3031780 + ... + 3032221.

It is an arithmetic number, because the mean of its divisors is an integer number (191016063).

Almost surely, 2^1340144221 is an apocalyptic number.

It is an amenable number.

1340144221 is a deficient number, since it is larger than the sum of its proper divisors (187984283).

1340144221 is a wasteful number, since it uses less digits than its factorization.

1340144221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6064031.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 1340144221 is about 36607.9802911879. The cubic root of 1340144221 is about 1102.5133222373.

Adding to 1340144221 its reverse (1224410431), we get a palindrome (2564554652).

The spelling of 1340144221 in words is "one billion, three hundred forty million, one hundred forty-four thousand, two hundred twenty-one".