1340506121 has 4 divisors (see below), whose sum is σ = 1386730500. Its totient is φ = 1294281744.

The previous prime is 1340506103. The next prime is 1340506127. The reversal of 1340506121 is 1216050431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1216050431 = 28517 ⋅42643.

It can be written as a sum of positive squares in 2 ways, for example, as 833130496 + 507375625 = 28864^2 + 22525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1340506121 - 2¹⁴ = 1340489737 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1340506127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23112146 + ... + 23112203.

It is an arithmetic number, because the mean of its divisors is an integer number (346682625).

Almost surely, 2^1340506121 is an apocalyptic number.

It is an amenable number.

1340506121 is a deficient number, since it is larger than the sum of its proper divisors (46224379).

1340506121 is an equidigital number, since it uses as much as digits as its factorization.

1340506121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46224378.

The product of its (nonzero) digits is 720, while the sum is 23.

The square root of 1340506121 is about 36612.9228688451. The cubic root of 1340506121 is about 1102.6125562487.

Adding to 1340506121 its reverse (1216050431), we get a palindrome (2556556552).

The spelling of 1340506121 in words is "one billion, three hundred forty million, five hundred six thousand, one hundred twenty-one".