1340134021 has 4 divisors (see below), whose sum is σ = 1418965452. Its totient is φ = 1261302592.

The previous prime is 1340134013. The next prime is 1340134063. The reversal of 1340134021 is 1204310431.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 793041921 + 547092100 = 28161^2 + 23390^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340134021 - 2³ = 1340134013 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1340134021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340134091) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39415690 + ... + 39415723.

It is an arithmetic number, because the mean of its divisors is an integer number (354741363).

Almost surely, 2^1340134021 is an apocalyptic number.

It is an amenable number.

1340134021 is a deficient number, since it is larger than the sum of its proper divisors (78831431).

1340134021 is an equidigital number, since it uses as much as digits as its factorization.

1340134021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78831430.

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

The square root of 1340134021 is about 36607.8409770366. The cubic root of 1340134021 is about 1102.5105251094.

Adding to 1340134021 its reverse (1204310431), we get a palindrome (2544444452).

The spelling of 1340134021 in words is "one billion, three hundred forty million, one hundred thirty-four thousand, twenty-one".