1321424321 has 16 divisors (see below), whose sum is σ = 1570329600. Its totient is φ = 1088087040.

The previous prime is 1321424281. The next prime is 1321424323. The reversal of 1321424321 is 1234241231.

It is a cyclic number.

It is not a de Polignac number, because 1321424321 - 2¹⁸ = 1321162177 is a prime.

It is a super-2 number, since 2×1321424321² = 3492324472260622082, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1321424323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7505 + ... + 51953.

It is an arithmetic number, because the mean of its divisors is an integer number (98145600).

Almost surely, 2^1321424321 is an apocalyptic number.

It is an amenable number.

1321424321 is a deficient number, since it is larger than the sum of its proper divisors (248905279).

1321424321 is a wasteful number, since it uses less digits than its factorization.

1321424321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44624.

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

The square root of 1321424321 is about 36351.4005369807. The cubic root of 1321424321 is about 1097.3557204358.

Adding to 1321424321 its reverse (1234241231), we get a palindrome (2555665552).

The spelling of 1321424321 in words is "one billion, three hundred twenty-one million, four hundred twenty-four thousand, three hundred twenty-one".