1321430215 has 16 divisors (see below), whose sum is σ = 1813174272. Its totient is φ = 905660064.

The previous prime is 1321430177. The next prime is 1321430261. The reversal of 1321430215 is 5120341231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321430215 - 2¹⁵ = 1321397447 is a prime.

It is a super-2 number, since 2×1321430215² = 3492355626229892450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68692 + ... + 85798.

It is an arithmetic number, because the mean of its divisors is an integer number (113323392).

Almost surely, 2^1321430215 is an apocalyptic number.

1321430215 is a deficient number, since it is larger than the sum of its proper divisors (491744057).

1321430215 is a wasteful number, since it uses less digits than its factorization.

1321430215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19326.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1321430215 is about 36351.4816066691. The cubic root of 1321430215 is about 1097.3573519594.

Adding to 1321430215 its reverse (5120341231), we get a palindrome (6441771446).

The spelling of 1321430215 in words is "one billion, three hundred twenty-one million, four hundred thirty thousand, two hundred fifteen".