1521321323 has 4 divisors (see below), whose sum is σ = 1524103080. Its totient is φ = 1518539568.

The previous prime is 1521321301. The next prime is 1521321343. The reversal of 1521321323 is 3231231251.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1521321323 - 2⁶ = 1521321259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1521321343) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1390058 + ... + 1391151.

It is an arithmetic number, because the mean of its divisors is an integer number (381025770).

Almost surely, 2^1521321323 is an apocalyptic number.

1521321323 is a deficient number, since it is larger than the sum of its proper divisors (2781757).

1521321323 is an equidigital number, since it uses as much as digits as its factorization.

1521321323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781756.

The product of its digits is 1080, while the sum is 23.

The square root of 1521321323 is about 39004.1193080936. The cubic root of 1521321323 is about 1150.1124837674.

Adding to 1521321323 its reverse (3231231251), we get a palindrome (4752552574).

The spelling of 1521321323 in words is "one billion, five hundred twenty-one million, three hundred twenty-one thousand, three hundred twenty-three".