1320412021 has 4 divisors (see below), whose sum is σ = 1365943500. Its totient is φ = 1274880544.

The previous prime is 1320412019. The next prime is 1320412043. The reversal of 1320412021 is 1202140231.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1202140231 = 24547 ⋅48973.

It can be written as a sum of positive squares in 2 ways, for example, as 1027523025 + 292888996 = 32055^2 + 17114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320412021 - 2¹ = 1320412019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1320411986 and 1320412004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320412001) 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 3 ways as a sum of consecutive naturals, for example, 22765696 + ... + 22765753.

It is an arithmetic number, because the mean of its divisors is an integer number (341485875).

Almost surely, 2^1320412021 is an apocalyptic number.

It is an amenable number.

1320412021 is a deficient number, since it is larger than the sum of its proper divisors (45531479).

1320412021 is an equidigital number, since it uses as much as digits as its factorization.

1320412021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45531478.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 1320412021 is about 36337.4740591583. The cubic root of 1320412021 is about 1097.0754327286.

Adding to 1320412021 its reverse (1202140231), we get a palindrome (2522552252).

The spelling of 1320412021 in words is "one billion, three hundred twenty million, four hundred twelve thousand, twenty-one".