1321323300 has 288 divisors, whose sum is σ = 4908435840. Its totient is φ = 301363200.

The previous prime is 1321323299. The next prime is 1321323301. The reversal of 1321323300 is 33231231.

It is an interprime number because it is at equal distance from previous prime (1321323299) and next prime (1321323301).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (1321323301) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 503592 + ... + 506208.

It is an arithmetic number, because the mean of its divisors is an integer number (17043180).

Almost surely, 2^1321323300 is an apocalyptic number.

1321323300 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1321323300, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2454217920).

1321323300 is an abundant number, since it is smaller than the sum of its proper divisors (3587112540).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1321323300 is a wasteful number, since it uses less digits than its factorization.

1321323300 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2668 (or 2655 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 18.

The square root of 1321323300 is about 36350.0110041249. The cubic root of 1321323300 is about 1097.3277559645.

Adding to 1321323300 its reverse (33231231), we get a palindrome (1354554531).

The spelling of 1321323300 in words is "one billion, three hundred twenty-one million, three hundred twenty-three thousand, three hundred".