1344140021 has 12 divisors (see below), whose sum is σ = 1585014732. Its totient is φ = 1136334528.

The previous prime is 1344139999. The next prime is 1344140027. The reversal of 1344140021 is 1200414431.

It can be written as a sum of positive squares in 2 ways, for example, as 1175529796 + 168610225 = 34286^2 + 12985^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1344140021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1344139975 and 1344140002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1344140027) 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 11 ways as a sum of consecutive naturals, for example, 184310 + ... + 191463.

It is an arithmetic number, because the mean of its divisors is an integer number (132084561).

Almost surely, 2^1344140021 is an apocalyptic number.

It is an amenable number.

1344140021 is a deficient number, since it is larger than the sum of its proper divisors (240874711).

1344140021 is an equidigital number, since it uses as much as digits as its factorization.

1344140021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375860 (or 375853 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 20.

The square root of 1344140021 is about 36662.5152028608. The cubic root of 1344140021 is about 1103.6079933607.

Adding to 1344140021 its reverse (1200414431), we get a palindrome (2544554452).

The spelling of 1344140021 in words is "one billion, three hundred forty-four million, one hundred forty thousand, twenty-one".