1320321210 has 256 divisors, whose sum is σ = 3839754240. Its totient is φ = 287400960.

The previous prime is 1320321161. The next prime is 1320321241. The reversal of 1320321210 is 121230231.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1320321210.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 10396167 + ... + 10396293.

It is an arithmetic number, because the mean of its divisors is an integer number (14999040).

Almost surely, 2^1320321210 is an apocalyptic number.

1320321210 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1320321210, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1919877120).

1320321210 is an abundant number, since it is smaller than the sum of its proper divisors (2519433030).

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

1320321210 is a wasteful number, since it uses less digits than its factorization.

1320321210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 1320321210 is about 36336.2244874175. The cubic root of 1320321210 is about 1097.0502817910.

Adding to 1320321210 its reverse (121230231), we get a palindrome (1441551441).

The spelling of 1320321210 in words is "one billion, three hundred twenty million, three hundred twenty-one thousand, two hundred ten".