1340134421 has 4 divisors (see below), whose sum is σ = 1340419392. Its totient is φ = 1339849452.

The previous prime is 1340134403. The next prime is 1340134427. The reversal of 1340134421 is 1244310431.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1340134421 - 2²² = 1335940117 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340134427) 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, 135311 + ... + 144876.

It is an arithmetic number, because the mean of its divisors is an integer number (335104848).

Almost surely, 2^1340134421 is an apocalyptic number.

It is an amenable number.

1340134421 is a deficient number, since it is larger than the sum of its proper divisors (284971).

1340134421 is an equidigital number, since it uses as much as digits as its factorization.

1340134421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 284970.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 1340134421 is about 36607.8464403466. The cubic root of 1340134421 is about 1102.5106348009.

Adding to 1340134421 its reverse (1244310431), we get a palindrome (2584444852).

The spelling of 1340134421 in words is "one billion, three hundred forty million, one hundred thirty-four thousand, four hundred twenty-one".