1320200321 has 16 divisors (see below), whose sum is σ = 1491393600. Its totient is φ = 1157620800.

The previous prime is 1320200311. The next prime is 1320200327. The reversal of 1320200321 is 1230020231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1320200321 - 2¹⁴ = 1320183937 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320200296 and 1320200305.

It is not an unprimeable number, because it can be changed into a prime (1320200327) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 502391 + ... + 505011.

It is an arithmetic number, because the mean of its divisors is an integer number (93212100).

Almost surely, 2^1320200321 is an apocalyptic number.

1320200321 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1320200321 is a deficient number, since it is larger than the sum of its proper divisors (171193279).

1320200321 is a wasteful number, since it uses less digits than its factorization.

1320200321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4240.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1320200321 is about 36334.5609716149. The cubic root of 1320200321 is about 1097.0167986864.

Adding to 1320200321 its reverse (1230020231), we get a palindrome (2550220552).

The spelling of 1320200321 in words is "one billion, three hundred twenty million, two hundred thousand, three hundred twenty-one".