1340043121 has 2 divisors, whose sum is σ = 1340043122. Its totient is φ = 1340043120.

The previous prime is 1340043091. The next prime is 1340043143. The reversal of 1340043121 is 1213400431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1190250000 + 149793121 = 34500^2 + 12239^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340043121 - 2⁷ = 1340042993 is a prime.

It is a super-2 number, since 2×1340043121² = 3591431132278841282, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1340043721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670021560 + 670021561.

It is an arithmetic number, because the mean of its divisors is an integer number (670021561).

Almost surely, 2^1340043121 is an apocalyptic number.

It is an amenable number.

1340043121 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340043121 is an equidigital number, since it uses as much as digits as its factorization.

1340043121 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 1340043121 is about 36606.5994186841. The cubic root of 1340043121 is about 1102.4855971367.

Adding to 1340043121 its reverse (1213400431), we get a palindrome (2553443552).

The spelling of 1340043121 in words is "one billion, three hundred forty million, forty-three thousand, one hundred twenty-one".