1324321421 has 4 divisors (see below), whose sum is σ = 1324399644. Its totient is φ = 1324243200.

The previous prime is 1324321409. The next prime is 1324321447. The reversal of 1324321421 is 1241234231.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1241234231 = 4001 ⋅310231.

It can be written as a sum of positive squares in 2 ways, for example, as 678602500 + 645718921 = 26050^2 + 25411^2 .

It is a cyclic number.

It is not a de Polignac number, because 1324321421 - 2¹⁸ = 1324059277 is a prime.

It is a super-3 number, since 3×1324321421³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1324321121) 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, 1940 + ... + 51501.

It is an arithmetic number, because the mean of its divisors is an integer number (331099911).

Almost surely, 2^1324321421 is an apocalyptic number.

It is an amenable number.

1324321421 is a deficient number, since it is larger than the sum of its proper divisors (78223).

1324321421 is an equidigital number, since it uses as much as digits as its factorization.

1324321421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78222.

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

The square root of 1324321421 is about 36391.2272532818. The cubic root of 1324321421 is about 1098.1570852215.

Adding to 1324321421 its reverse (1241234231), we get a palindrome (2565555652).

The spelling of 1324321421 in words is "one billion, three hundred twenty-four million, three hundred twenty-one thousand, four hundred twenty-one".