1320021200 has 60 divisors (see below), whose sum is σ = 3338283360. Its totient is φ = 500215680.

The previous prime is 1320021169. The next prime is 1320021289. The reversal of 1320021200 is 21200231.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 79244 + ... + 94443.

It is an arithmetic number, because the mean of its divisors is an integer number (55638056).

Almost surely, 2^1320021200 is an apocalyptic number.

1320021200 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1320021200 is an abundant number, since it is smaller than the sum of its proper divisors (2018262160).

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

1320021200 is a wasteful number, since it uses less digits than its factorization.

1320021200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173724 (or 173713 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 1320021200 is about 36332.0960033962. The cubic root of 1320021200 is about 1096.9671830762.

Adding to 1320021200 its reverse (21200231), we get a palindrome (1341221431).

The spelling of 1320021200 in words is "one billion, three hundred twenty million, twenty-one thousand, two hundred".