1320021011 has 4 divisors (see below), whose sum is σ = 1328763024. Its totient is φ = 1311279000.

The previous prime is 1320021007. The next prime is 1320021047. The reversal of 1320021011 is 1101200231.

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 1320021011 - 2² = 1320021007 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320020983 and 1320021001.

It is not an unprimeable number, because it can be changed into a prime (1320021061) 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, 4370780 + ... + 4371081.

It is an arithmetic number, because the mean of its divisors is an integer number (332190756).

Almost surely, 2^1320021011 is an apocalyptic number.

1320021011 is a deficient number, since it is larger than the sum of its proper divisors (8742013).

1320021011 is an equidigital number, since it uses as much as digits as its factorization.

1320021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8742012.

The product of its (nonzero) digits is 12, while the sum is 11.

The square root of 1320021011 is about 36332.0934023901. The cubic root of 1320021011 is about 1096.9671307218.

Adding to 1320021011 its reverse (1101200231), we get a palindrome (2421221242).

The spelling of 1320021011 in words is "one billion, three hundred twenty million, twenty-one thousand, eleven".