1321430015 has 4 divisors (see below), whose sum is σ = 1585716024. Its totient is φ = 1057144008.

The previous prime is 1321430003. The next prime is 1321430027. The reversal of 1321430015 is 5100341231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5100341231 = 163 ⋅31290437.

It is an interprime number because it is at equal distance from previous prime (1321430003) and next prime (1321430027).

It is a cyclic number.

It is not a de Polignac number, because 1321430015 - 2¹⁸ = 1321167871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132142997 + ... + 132143006.

It is an arithmetic number, because the mean of its divisors is an integer number (396429006).

Almost surely, 2^1321430015 is an apocalyptic number.

1321430015 is a deficient number, since it is larger than the sum of its proper divisors (264286009).

1321430015 is an equidigital number, since it uses as much as digits as its factorization.

1321430015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264286008.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1321430015 is about 36351.4788557495. The cubic root of 1321430015 is about 1097.3572965973.

Adding to 1321430015 its reverse (5100341231), we get a palindrome (6421771246).

The spelling of 1321430015 in words is "one billion, three hundred twenty-one million, four hundred thirty thousand, fifteen".