1340414021 has 2 divisors, whose sum is σ = 1340414022. Its totient is φ = 1340414020.

The previous prime is 1340413981. The next prime is 1340414039. The reversal of 1340414021 is 1204140431.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1316891521 + 23522500 = 36289^2 + 4850^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1340414021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1340413984 and 1340414002.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1340414081) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 670207010 + 670207011.

It is an arithmetic number, because the mean of its divisors is an integer number (670207011).

Almost surely, 2^1340414021 is an apocalyptic number.

It is an amenable number.

1340414021 is a deficient number, since it is larger than the sum of its proper divisors (1).

1340414021 is an equidigital number, since it uses as much as digits as its factorization.

1340414021 is an odious number, because the sum of its binary digits is odd.

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

The square root of 1340414021 is about 36611.6650946116. The cubic root of 1340414021 is about 1102.5873038606.

Adding to 1340414021 its reverse (1204140431), we get a palindrome (2544554452).

The spelling of 1340414021 in words is "one billion, three hundred forty million, four hundred fourteen thousand, twenty-one".