1320130021 has 6 divisors (see below), whose sum is σ = 1535661510. Its totient is φ = 1131539976.

The previous prime is 1320130003. The next prime is 1320130037. The reversal of 1320130021 is 1200310231.

It can be written as a sum of positive squares in only one way, i.e., 1319868900 + 261121 = 36330^2 + 511^2 .

It is not a de Polignac number, because 1320130021 - 2¹¹ = 1320127973 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1320129983 and 1320130010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320130421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 13470666 + ... + 13470763.

It is an arithmetic number, because the mean of its divisors is an integer number (255943585).

Almost surely, 2^1320130021 is an apocalyptic number.

It is an amenable number.

1320130021 is a deficient number, since it is larger than the sum of its proper divisors (215531489).

1320130021 is an equidigital number, since it uses as much as digits as its factorization.

1320130021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26941443 (or 26941436 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1320130021 is about 36333.5935602302. The cubic root of 1320130021 is about 1096.9973264774.

Adding to 1320130021 its reverse (1200310231), we get a palindrome (2520440252).

The spelling of 1320130021 in words is "one billion, three hundred twenty million, one hundred thirty thousand, twenty-one".